DAMASCUS  - At least seven people were killed when a car bomb exploded in the central Syrian city of Homs Thursday, Syrian state media reported.

“Seven killed and others injured according to a first toll in a terrorist car bomb explosion in Wadi Dahab in Homs,” state television said.

The blast was also reported by the Syrian Observatory for Human Rights, a Britain-based monitor, which said the neighbourhood is majority Alawite - the sect to which President Bashar al-Assad belongs.

In May, Syrian government forces retook control of almost all of Homs, once dubbed the “capital of the revolution,” after a deal allowing the withdrawal of rebel fighters trapped under siege.

Alawite districts and areas under regime control in Homs have come under attack, including with car bombs, in recent weeks.

On May 25, 12 people were killed in a twin car bomb attack in the city’s Zahra neighbourhood, just days after a similar attack there killed 100 people.

Those attacks were claimed by Al-Nusra Front, the official affiliate of Al-Qaeda in Syria.

Meanwhile north of Homs, the Observatory said at least 18 rebels, including fighters from Al-Nusra, were killed battling regime forces near the village of Umm Sharshuh.

On Thursday, regime warplanes carried out air raids on the village, which rebels captured a day earlier.

Meanwhile, at least 50,000 Syrian refugee children in Lebanon are working, often in dire conditions and for 12 hours a day, to pay for food and shelter for their families, aid organisation CARE said.

More than a million Syrian refugees live in Lebanon, making up a quarter of the country’s population, having fled a civil war in its fourth year, which has left more than 160,000 dead.

Only 50 percent of Syrian refugee children in the region attend school, and only 30 percent in Lebanon, CARE said.

Children working as street vendors say they are earning less than $5 a day. Others work at coffee shops and markets or on farms and construction sites. Some say they commute for hours on buses into the capital Beirut.

Mohammad, a 14-year-old shoe shiner who fled Syria a year ago, said he makes about $6 a day, picking up work as he walks up and down the streets of Beirut’s Hamra shopping district.

Mohammad said the money goes towards feeding his younger siblings. Asked if he would like to return to school, he said: “God willing, when I return to Syria.”

Other children beg, often with family members, in Hamra and others pack bags in minimarkets or work as car valets.

In Jordan, where nearly 600,000 Syrian refugees live, child labour has doubled nationwide to 60,000 since the start of the war, CARE said this week.

The group is giving cash to families in Jordan and Lebanon, which has banned refugee camps, to allow children to attend school rather than work, but funds are insufficient, CARE said.

“The conditions are harsh and safety and security of the children is not guaranteed,” Johanna Mitscherlich, Regional Emergency Communications Coordinator for CARE Jordan, said in an email, noting that housing is inadequate and that families struggle by on one or two meals a day.

“There are also quite a few children who have injuries from the war or who are still traumatised and can therefore neither work nor go to school,” she said.

Thursday marks International Day against Child Labour with about 168 million children working worldwide, down by a third since 2000, according to the International Labour Organisation.