Thomas Wyllie and Alex Bolland "hero-worshipped" the Columbine shooters and had a hit-list of targets.
Firefighters said half-a-tonne of ammonia is believed to be leaking on an industrial estate.
The architects used historical images and drawings as reference where original details had been lost.
The winners and losers of the heatwave
How a glove puppet is still 'amazingly popular'
Showcasing the best images sent to us from around England
Kate Osborne vanished while living in Bali in 2003
Views of Birmingham recaptured 50 years on
Reality Check: Is there more crime in hot weather?
England's Tommy Fleetwood is a shot off the lead at The Open with Rory McIlroy a shot behind him after strong second rounds.
Do you know your bhuna from your balti?
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