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Summary

  1. Second man arrested in connection with Parsons Green attack
  2. The 21-year-old was detained in Hounslow, west London on Saturday night
  3. On Saturday morning, Kent Police arrested an 18-year-old man in Dover
  4. UK terror threat level reduced from 'critical' to 'severe'
  5. Police 'keeping an open mind' on number of suspects involved
  6. Of the 30 people injured, one is still being treated in hospital

Live Reporting

By Owen Amos and Dearbail Jordan

All times stated are UK

  1. What we've learned today

    • The terror threat level has been reduced from "critical" to "severe"
    • A second suspect was arrested in Hounslow, west London on Saturday at 11.50pm
    • Police are searching a home in nearby Stanwell, Surrey in connection with that arrest
    • A search is also taking place at a property in Sunbury-on-Thames where it is believed an 18-year old suspect lives. He was arrested in Dover on Saturday morning
    • Of the 30 people injured, one is still being treated in hospital
  2. The scene in Stanwell, Surrey

    A property is being searched in Stanwell in connection with the arrest of a 21-year-old man in nearby Hounslow yesterday.

    A house in Stanwell, Surrey
  3. Investigators 'getting greater understanding' of bomb

    Explosive device on a District Line Tube tain

    Assistant commissioner Mark Rowley says that investigators "are getting a greater understanding of the preparation of the device" used in Friday's attack.

    Two house searches are continuing - both in Surrey - following the arrests of an 18-year old man in Kent and a 21-year old male in Hounslow on Saturday.

    Mr Rowley said: "The high pace and rapid progress of this investigation is continuing."

  4. Threat level still at severe, say police

    Assistant commissioner Mark Rowley says that although the threat level to the UK from international terrorism has been reduced from critical "there is still a severe threat level".

    He said: "If you see something you are worried about or know somebody you are worried about don't hesitate, just ACT. Please call us on the Anti-Terrorism Hotline 0800 789 321 or report online by visiting www.gov.uk/ACT.

  5. Increased police presence will continue

    Assistant commissioner Mark Rowley, national lead for counter terrorism policing, has given an update on the downgrade in the UK terrorist threat level.

    Quote Message: Members of the public will be wondering what that means in terms of their travel into work tomorrow. For practical and precautionary reasons we made the decision that the increased resources will continue for the beginning of this week. So the public will still see that high level of policing presence; some armed, some unarmed.
    Quote Message: The military support we have had in place under Operation Temperer will start to phase out as we move through the coming week. There are detailed and well-rehearsed plans in place to ensure a smooth transition from Operation Temperer, and military personnel will remain at readiness to deploy in support of the police should future security situations require.
    Quote Message: I want to stress however, that specialist teams, well-rehearsed at dealing with major incidents, continue to provide a strong visible presence throughout the capital and across the UK."
  6. Police keeping 'an open mind'

    Investigators search a house in Sunbury-on-Thames

    Neil Basu, the Metropolitan Police's senior national co-ordinator for counter terrorism, says that investigators are keeping an open mind over the number of people involved in Friday's incident.

    He says: "At this stage we are keeping an open mind around whether more than one person is responsible for the attack and we are still pursuing numerous lines of enquiry and at a great pace.

    "The Metropolitan Police and its partners across the Counter Terrorism Policing Network have been working around the clock and through the night to identify, locate and arrest those responsible for this cowardly crime."

  7. Police making 'good progress'

    Police on street

    Home Secretary Amber Rudd says that the police have made "good progress" on their investigation into the bombing on a Tube train on Friday.

  8. Military to return to original positions

    Home Secretary Amber Rudd says that over the next few days the military will return to their original positions.

    Military personnel have been supporting the police following the Parsons Green bombing on Friday.

    Ms Rudd made the announcement as the UK terrorist threat level was reduced from critical to severe.

    She says: "The Joint Terrorist Analysis Centre which reviews the threat level that the UK is under have decided to lower than level from critical to severe."

    She says that severe still means that an attack is highly likely "so I would urge everyone to be vigilant but not alarmed".

  9. Search in Stanwell

    Scotland Yard has confirmed that a search is taking place at a residential address in Stanwell, Surrey, in connection with the arrest of a 21-year-old man in nearby Hounslow yesterday.

  10. What the terror threat levels mean

    From the MI5 website:

    • LOW means an attack is unlikely
    • MODERATE means an attack is possible, but not likely
    • SUBSTANTIAL means an attack is a strong possibility
    • SEVERE means an attack is highly likely
    • CRITICAL means an attack is expected imminently
  11. BreakingTerror threat reduced to 'severe'

    The terror threat level is being reduced from "critical" to "severe", Home Secretary Amber Rudd announces.

  12. Sunbury search 'may last several days'

    Forensic teams have placed tents at the front and back of the property
    Image caption: Forensic teams have placed tents at the front and back of the property

    Our correspondent Kathryn Stanczyszyn is in Sunbury-on-Thames, where investigators are still searching a house where it's thought a Parsons Green suspect lives.

    She says one resident was told by police that activity at the house could last several days.

    There is a semi-permanent cordon taking in the property that is being searched as well as seven houses on each side.

    Our correspondent says residents are distressed by what has happened, but are happy they have been allowed back into their homes.

  13. Why is the terror threat level 'critical'?

    Raffaello Pantucci, director of international security studies at the Royal United Services Institute, told BBC News: "That they have left it at critical is possibly a reflection of the fact that they have not got total clarity on what exactly has taken place. If they think they have disrupted the bomb-maker they may be looking at other people out there. And if you look back at recent history, there are often copy-cats - people who use an attack as a springboard to launch something they have been thinking about for some time."

  14. Section 41 explained

    From the Press Association...

    Both suspects arrested in connection with the Parsons Green attack are being held under section 41 of the Terrorism Act 2000.

    This law gives police the power to arrest someone suspected of terror-related offences without a warrant.

    It also allows police to detain suspects without charge beyond the four days allowed for suspects connected to other crimes.

    The maximum period of pre-charge detention has varied but currently stands at a maximum of 14 days.

    Detention must be reviewed at 12-hour intervals during the first 48 hours.

    After that, warrants for further detention must be obtained from a court.

    Following the 7/7 bombings in 2005, the government attempted to get the maximum period of detention without charge extended to 90 days, but the proposal was defeated in the House of Commons.

  15. Outer cordon lifted in Sunbury

  16. Police search Hounslow property

    Forensic teams are searching a property in Hounslow, west London, following the arrest of a second man in connection with the Parsons Green bombing on Friday.

    Police have put a cordon up around an area containing the house. People have been told to stay in their homes.