The US and Russia have announced a fresh ceasefire in Syria, months after the last one failed.

It is due to start on Monday and is aimed at getting more humanitarian aid in.

A truce announced in February lasted just weeks.

 US secretary of state John Kerry says a 7-day ceasefire will begin at sunset on Monday:

Russian Foreign Minister Sergei Lavrov says both countries will carry out airstrikes against banned Islamist groups if the truce holds for seven days: