The Islamic State, which advocates public stoning for adultery, has opened a "marriage bureau" for women who want to wed its fighters in territory they control in Syria and Iraq.

The jihadist group's office is operating from Al-Bab, a town in Aleppo province of northern Syria, for "single women and widows who would like to marry IS fighters", said the Syrian Observatory for Human Rights.

Six children were among at least 15 civilians killed in overnight bomb attacks by government and rebel forces in the divided city of Aleppo, a monitoring group said Monday.

"At least nine civilians, three of them children, were killed in barrel bombs (dropped by regime aircraft) in Shaar," an eastern district, said the Syrian Observatory for Human Rights.

Syrian president Bashar Assad was given a warm reception by the faithful on Monday when he joined in Eid al-Fitr prayers in Damascus, to mark the end of the fasting month of Ramadan.

Assad took part in prayers at the Al-Kheir mosque, in Muhajarin, near his home in northwest Damascus.

A Lebanese national was severely wounded in the ongoing battles along the border with Syria, the state-run National News Agency reported.

According to NNA, 20-year-old Mohammed Omar Awdeh was seriously injured in the outskirts of the eastern border town of Arsal.

Islamic State jihadists, building on vast land grabs in Iraq, have seized an army position in the Syrian city of Hasakeh, a monitoring group said Sunday.

On another front in Syria's complex civil war, rebels seeking President Bashar Assad's ouster captured a weapons depot in Hama province, said the Syrian Observatory for Human Rights.

A Syrian national was released on Sunday in al-Hillanyieh in the Bekaa region after a five-day kidnap ordeal.

No ransom was paid for the kidnappers in exchange for the release of Abdul Karim Ali, the state-run National News Agency reported.

When Islamic State fighters first seized Iraq's city of Mosul, life improved for many residents. But some now say the economic and cultural cost of jihadist rule is beginning to bite.

Syrian government troops Saturday recaptured the Shaar gas field in Homs province from the Islamic State, a week after the jihadists seized it, the Syrian Observatory for Human Rights said.

"Since this morning, there has been fighting around the Al-Shaar field between regime forces and the IS. The army has succeeded in ejecting the jihadists, and it now controls the site and surrounding hills," Observatory chief Rami Abdel Rahman told Agence France Presse.

A parliament session was held on Saturday in order to express Lebanon's solidarity with the Palestinian Gaza Strip and the Iraqi city of Mosul.

The session was chaired by Speaker Nabih Berri and attended by the majority of political blocs.

Syria's Al-Qaida affiliate has released a video of a young U.S. suicide bomber from Florida who blew himself up at an army post in the northwest of the country.

Moner Mohammad Abu Salha, alias Abu Hurayra al-Amriki, was believed to be the first American national to carry out such an attack in Syria's more than three-year-old war.