Several Coptic Christian Egyptians have been killed in Libya in recent years.

Islamist militants have abducted 20 Egyptian Christians in Libya in recent days, a source close to the government said Saturday.

Earlier, Witness Hanna Aziz told The Associated Press that gunmen in the Libyan city of Sirte went room to room in their residence at 2:30 a.m. Saturday and asked for identification papers to separate Muslim workers from Christians. Aziz says the gunmen handcuffed the Christians and drove away with them.

The source said the Ansar al-Sharia militia had kidnapped 13 of them on Saturday in the coastal city of Sirte and the rest of them there over the past few days.

“They were 15 armed and masked men who came in four vehicles. They had a list of full names of Christians in the building. While checking IDs, Muslims were left aside while Christians were grabbed,” Aziz said, adding that he survived simply because he didn’t open his door.

“I heard my friends screaming but they were quickly shushed at gunpoint. After that, we heard nothing,” said Aziz who said he has three relatives among the hostages. “I am still in my room waiting for them to take me. I want to die with them,” he added.

Abu Makar, a Coptic priest in the workers’ hometown of Samalout in southern Egypt, confirmed the abduction took place. He said seven other Coptic Christians from Samalout were taken while trying to escape Sirte a few days earlier.

Sirte has become a safe haven for extremist Islamist groups like Ansar al-Shariah, blamed for the September 2013 attack on the U.S. Consulate in Benghazi that killed U.S. Ambassador Chris Stevens.

The abduction came on the heels of the killing of a Coptic couple – who used to work as doctors in Sirte- and their daughter.

There was no immediate comment from the Egyptian government. On Wednesday, the Foreign Ministry said that it is following up on the case of the first group of seven abducted Christians.

In March, the bodies of seven Christian Egyptians were found in the eastern city of Benghazi, killed by gunshots to the head while handcuffed.

In March 2013, dozens of Coptic Christians were tortured inside a detention center run by a powerful militia in Benghazi. The men, who were suspected of proselytizing, were rounded up in a market by gunmen who checked their right wrists for tattoos of crosses, a common mark worn by many Egyptian Christians.

Islamic extremist militias have been targeting Christians, women, journalists, refugees and those considered former loyalists of Muammar Qaddafi, who was toppled and killed in Libya’s 2011 civil war.

Egyptians became a top target for the militias after the Egyptian government began supporting the Libyan army battling Islamic militants.

“We are witnessing a pattern of persecution against Christians in Egypt; I fear for the lives of the hostages,” said Magdi Malak, a Cairo-based activist involved in the case.

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