Islamic StateIslamic State

•MPs will decide later whether to back UK air strikes in Syria against militants from so-called Islamic State.

•The debate will determine whether Britain joins the coalition forces currently fighting ISIS.

•UK Prime Minister David Cameron says IS is a threat to Britain's security.

• Labour leader Jeremy Corbyn opposes bombing but has given MPs a free vote amid divisions within his own ranks.

What you need to knowWhat you need to know

•The Commons debate begins at 11:30 GMT Today, with a vote expected at about 22:00.

•David Cameron had made it clear he would not hold a vote unless he was confident he would win.

•The majority of Conservatives are expected to vote in favour. The DUP and the Liberal Democrats have indicated they could vote in favour.

Why?Why?

•David Cameron says IS poses a terror threat to British people, and so the UK must strike IS in its "heartland" - Syria.

•He argues the UK has a moral obligation to get involved, and should not be "content with outsourcing our security to allies".

•Britain's laser-guided Brimstone missiles - which no other country has - would greatly help the coalition with precision targeting IS fighters, he says.

What difference would it make?What difference would it make?

•Mr Cameron has set out a seven point plan for the UK's proposed involvement in Syria, which involves military, diplomatic and humanitarian action.

•Reducing civilian casualties with Britains precision weapons.

•However, the prime minister agrees that air strike alone will not be enough.

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