At least 33 people are killed in a US-led coalition strike on a school used as a centre for displaced people near a jihadist-held Syrian town, a monitor says.

An Islamic State militant executes his mother in public in the Syrian city of Raqqa because she encouraged him to leave the group, the Syrian Observatory for Human Rights reports.

A teenage Austrian girl who fled to Syria along with her friend is believed to be beaten to death after being caught trying to flee the IS stronghold of Raqqa.

French police are examining what appears to be a suicide bomb belt dumped on a Paris street, 10 days after the attacks that killed 130 people.

Air strikes by France and other nations on the Islamic State (IS) stronghold of Raqqa in Syria since Sunday have killed at least 33 militants, activists say.

France launches "massive" air strikes on the Islamic State group's de-facto capital in Syria, destroying a jihadi training camp and a munitions dump in the city of Raqqa, where Iraqi intelligence officials say the attacks on Paris were planned.