A still of an explosion in Homs, Syria - unverified footage
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Syria conflict: Homs explosion 'kills a least 40'

At least 40 people have been killed in a rocket attack on an arms dump in Syria, the UK-based group the Syrian Observatory for Human Rights has said.

Unverified footage showed a huge fireball shooting into the sky over Homs city.

The rebel Free Syrian Army said it carried out the attack, which struck in a government-controlled area.

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