Bombs Jordan air force
Bombs are pictured on a Royal Jordanian Air Force plane at an air baseReuters

The US-led coalition has killed at least 20 Isis militants in a series of air strikes in north east Syria, according to a UK-based watchdog.

One civilian was killed in the series of bombing raids in the town of al-Shadadi, Hasaka province, according to the Syrian Observatory for Human Rights.

The aerial campaign against Isis, or Islamic State, has taken on renewed intensity in recent days as Jordan increased the number of bombings carried out by its forces in the wake of the group's execution of Jordanian pilot Moaz al-Kassasbeh.

Jordanian planes struck Isis targets on Thursday, according to state television, although the locations of the strikes were not given.

The US-led coalition launched the campaign against Isis in September in a bid to halt its territorial expanse through Iraq and Syria.

Meanwhile, militants from Isis launched an attack in the Western Iraqi province of Anbar on Friday.

Fighters attacked the town of al-Baghdadi, situated just 5km away from a US military base where US marines are carrying out training missions with the Iraqi army.