BEIRUT - 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 government bombing raids on the area, activists said Thursday.
The capture of the Nasib crossing - a crucial gateway for the Syrian government - is the latest in a series of setbacks for President Bashar Assad's forces in the past week. Fighters led by the Nusra Front seized the government-held city of Idlib in northwestern Syria and a major town, Busra Sham, in the south.
The Jordanian government closed the Nasib crossing Tuesday night for security reasons, as rebels clashed with Syrian forces on the other side. The rebels seized the crossing within 24 hours.
On Thursday, a plume of thick, black smoke was seen billowing from the Syrian side of the border with Jordan, as Syrian warplanes struck the area. An Associated Press cameraman said dozens of trucks were stranded on the Jordanian side and customs officials have been prevented from going to their offices.
Ahmad al-Masalmeh, an opposition activist based in the southern Syrian city of Daraa, said rebels completed "combing" operations in the area along the border early Thursday, adding that government forces withdrew in the direction of the nearby Sweida province.
Syrian state TV, however, quoted an unnamed military official as saying that government forces have regrouped near the crossing and taken "positions in new military points."
The Syrian Foreign Ministry issued a statement later saying that any use of the rebel-held crossing "will be considered illegitimate." The ministry said Syria closed the crossing after Jordan took a similar step on Wednesday.
Nasib is the only functioning crossing between Jordan and Syria and is considered a major gateway for Syria's government and for Syrian, Lebanese and Jordanian traders and merchants.
Al-Masalmeh said three armed factions spearheaded the offensive that captured Nasib and the nearby border guard posts known as 62, 63 and 67. He added that the Syrian government still controls a post known as the "Amman Brigade" east of Nasib.
The Britain-based Syrian Observatory for Human Rights, which relies on a network of activists inside Syria, said helicopter gunships attacked rebel positions in the area early Thursday.
In Damascus, a Palestinian official said Islamic State fighters were expelled from Yarmouk, a Palestinian refugee camp south of the capital, hours after they stormed it from the nearby neighborhood of Hajar Aswad. The infiltration marked the extremist group's deepest foray yet into the Syrian capital.
Khaled Abdul-Majid, secretary of the follow-up committee of the Damascus-based allied Palestinian factions, told The Associated Press that reinforcements reached the Palestinian faction called Aknaf Beit al-Maqdis, which was battling the extremist group in the camp.
"There are now intermittent clashes between Hajar Aswad neighborhood and the southern edge of Yarmouk camp," he said.