Opposition: At least 15 killed in car bomb in Syrian town

In this Jan. 5, 2017, photo, Secretary of State John Kerry speaks during a news conference at the State Department in Washington. Stung by years of failure to stop Syria’s bloodshed, the United States is now but a bystander to the civil war as President Barack Obama leaves office. Kerry still is speaking sporadically with Russian, Turkish and Arab foreign ministers about cease-fire efforts, and there are occasional consultations with the opposition. But less than two weeks before Donald Trump’s presidency begins, the outgoing administration is no longer even claiming to play the leading part in the peace mediation that it spearheaded unsuccessfully for years. (AP Photo/Cliff Owen) (The Associated Press)

Rescue workers attend to those injured after they and Syria’s opposition activists say dozens were killed when a car bomb went off in a busy market in a rebel-held Syrian town of Azaz along the Turkish border, Saturday, Jan. 7, 2017 . The Syrian Observatory for Human Rights monitoring group says the explosion Saturday was caused by a rigged water or fuel tanker, which explains the large blast and high death toll. (Saif Alnajdi, via AP) (The Associated Press)

Rescue workers attend to the wreckage after they and Syria’s opposition activists say dozens were killed when a car bomb went off in a busy market in a rebel-held Syrian town of Azaz along the Turkish border, Saturday, Jan. 7, 2017 . The Syrian Observatory for Human Rights monitoring group says the explosion Saturday was caused by a rigged water or fuel tanker, which explains the large blast and high death toll. (Saif Alnajdi, via AP) (The Associated Press)

Syria's opposition activists and rescue workers say at least 15 people were killed when a car bomb went off in a busy market in a Syrian rebel-held town along the Turkish border.

The Syrian Civil Defense, a team of first responders, says the initial casualty count shows that at least 15 people died Saturday in the explosion in Azaz, a border town in the northern province of Aleppo. The Syrian Observatory for Human Rights monitoring group put the death toll at 19, and other activists said the number is likely higher after the explosion ripped through a busy market.

Many rebels and civilians who were pushed out of Aleppo city during a massive government offensive late last year resettled in Azaz.

There was no immediate claim of responsibility.