Isis militants kidnap 150 Assyrians as activists warn attack could mark 'end of Christian presence' in Middle East

Number was raised from 90 on Wednesday

Islamic State fighters display their weaponry in the streets of Mosul, Iraq (AP)

The number of people taken by Isis militants who stormed Assyrian villages in Syria is now believed to be at 150, as activists warned the latest attacks could mark “the end of Christians” living in the Middle East.

"Are we seeing the end of Christianity? We are committed come what may, we will keep going to the end, but it looks as though the end could be very near,” he said at the time.

The Syrian Observatory for Human Rights (SOHR) said at least 90 people had been taken on Tuesdaym while Nuri Kino, the head of A Demand for Action, put the number between 70 and 100.

Rami Abdurrahman, the SOHR director, told The Independent that women and children are believed to among those taken by the group.

The abductions come as the SOHR rights said 132 Isis militants had been killed in the last four days by a mixture of US-led coalition air strikes and fighting on the ground from Kurdish forces in the northeastern Syrian province of Hasaka.

Syrian Kurdish militia launched two offensives against the militants in northeast Syria on Sunday, helped by US-led air strikes and Iraqi peshmerga.

Military experts said militants were trying to open a new front to relieve pressure on Islamic State after several losses since being driven from the Syrian town of Kobani near the border with Turkey, according to Reuters.

"Isis are losing in several areas so they want to wage an attack on a new area," said retired Jordanian general Fayez Dwiri.

The group most recently beheaded 21 Coptic Christians in Libya and released footage of their brutal killings.