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IS militants re-enter refugee camp in Damascus, clash with armed groups inside

  • Jordanians gather along the border with Syria near the Nasib crossing in the town of Jaber, north of Mafraq, Jordan, Thursday, April 2, 2015. Syrian rebels and fighters from the al-Qaida-affiliated Nusra Front have captured the only functioning border crossing with Jordan and three nearby military posts, prompting intense government bombing raids of the area, activists said Thursday. The Jordanian government had closed the crossing since Tuesday night for security reasons. (AP Photo/Raad Adayleh)

    Jordanians gather along the border with Syria near the Nasib crossing in the town of Jaber, north of Mafraq, Jordan, Thursday, April 2, 2015. Syrian rebels and fighters from the al-Qaida-affiliated Nusra Front have captured the only functioning border crossing with Jordan and three nearby military posts, prompting intense government bombing raids of the area, activists said Thursday. The Jordanian government had closed the crossing since Tuesday night for security reasons. (AP Photo/Raad Adayleh)  (The Associated Press)

  • Members of the Jordanian security forces talks with others in a black car as they stand guard at the Nasib border crossing in the town of Jaber, north of Mafraq, Jordan, Thursday, April 2, 2015. Syrian rebels and fighters from the al-Qaida-affiliated Nusra Front have captured the only functioning border crossing with Jordan and three nearby military posts, prompting intense government bombing raids of the area, activists said Thursday. The Jordanian government had closed the crossing since Tuesday night for security reasons. (AP Photo/Raad Adayleh)

    Members of the Jordanian security forces talks with others in a black car as they stand guard at the Nasib border crossing in the town of Jaber, north of Mafraq, Jordan, Thursday, April 2, 2015. Syrian rebels and fighters from the al-Qaida-affiliated Nusra Front have captured the only functioning border crossing with Jordan and three nearby military posts, prompting intense government bombing raids of the area, activists said Thursday. The Jordanian government had closed the crossing since Tuesday night for security reasons. (AP Photo/Raad Adayleh)  (The Associated Press)

Palestinian officials and activists say Islamic State militants are battling against armed groups inside a refugee camp in the Syrian capital, Damascus, and have made new advances inside the camp.

The militants stormed the Yarmouk camp on Wednesday, marking the extremist group's deepest foray yet into Damascus. They were expelled Thursday but officials said they re-entered the camp Friday.

One Palestinian official, Khaled Abdul-Majid, said the group is in control of half of the camp. The London-based Syrian Observatory for Human Rights also reported new advances by the group in the camp.

Abdul-Majid and another official, Anwar Raja, said the militants are fighting a Palestinian faction called Aknaf Beit al-Maqdis.