Syrian opposition activists say a regime airstrike on a gas station in northern Syria set off an explosion that's killed at least 30 people and wounded dozens more.

The explosion went off in a town (Ain Issa) about 25 miles from the Turkish border.

The Britain-based Syrian Observatory for Human Rights says witnesses report seeing at least 30 bodies and the death toll appears likely to rise.

Another group of anti-regime activists, the Local Coordination Committees, describes intense attacks by warplanes on the gas station.

Earlier, Syria's state-run TV said a military helicopter crashed near Damascus today after clipping the tail of a passenger jet with 200 people aboard.

The TV says the jet landed safely at Damascus airport and nobody on board was injured.

The helicopter went down southeast of Douma, a Damascus suburb that has seen clashes in recent days.