Russia says chemical weapons experts will arrive at the site of an alleged poisoned gas attack in Syria tomorrow.
Later, British MPs will hold a second debate on the airstrikes the UK joined as a result of the action - which is being blamed on the Syrian regime.
They said yesterday they felt the situation in Syria had been considered before Theresa May gave the go-ahead for the UK to join military action.
But they didn't get to vote on whether they approved of that decision.
Labour leader Jeremy Corbyn wants them to consider if Parliament should have the power to stop the UK going to war.