Egypt's main jihadist group pledges allegiance to IS

Egypt's deadliest militant group, Ansar Beit al-Maqdis, pledged its allegiance to the Islamic State organisation in Iraq and Syria, in a recording posted on its Twitter account on Monday, AFP reported.

The announcement is the most significant pledge of support for IS in the region outside Iraq and Syria, suggesting its influence over militant groups is overshadowing its once dominant Al-Qaeda rivals.

Ansar Beit al-Maqdis has waged an insurgency from its Sinai Peninsula stronghold that has killed scores of policemen and soldiers since the Egyptian army ousted Islamist president Mohamed Morsi in July last year.

It was not immediately clear whether Ansar Beit al-Maqdis's pledge would mean a shift in tactics to attack Western targets in Egypt, as demanded by IS.

The group has so far focused its attacks on security forces, and once bombed a tourist bus on the border with Israel, killing three South Koreans.

"We announce our pledge of allegiance to the caliph Ibrahim Ibn Awad... to listen and obey," the audio recording said, referring to IS leader Abu Bakr al-Baghdadi.

"We call on all Muslims everywhere to pledge allegiance to the caliph and support him," the recording said.