■ Bombings killed at least four in Syria’s rebel-held Idlib province.

Raids, Russian planes target southern edge of Idlib province

BEIRUT — Syrian government and Russian warplanes on Saturday targeted the southern edge of Idlib province in what activists described as the most intense airstrikes in weeks, ratcheting up military pressure on the densely populated rebel-held bastion.

More than 60 air raids killed at least four civilians in southern Idlib, according to the Syrian Observatory for Human Rights and rescue workers. The bombings also included indiscriminate barrel bombs, dropped from choppers, invariably blamed on the government.

The bombings, including shelling from government areas, came a day after Iran and Russia backed a military campaign in the rebel-held area despite Turkey’s pleas for a cease-fire. Turkey has troops and 12 observations points that circle Idlib.

State-run Al-Ikhbariya TV said the government was retaliating against overnight shelling from rebel-held areas on a government-held town in Hama province, south of Idlib. The shelling late Friday in Mhradah killed nine civilians, according to state media. The state news agency SANA said government forces have shelled “terrorist” posts in northern Hama.

But the government and Russian raids targeted a wide swath of rebel-held area in the southern edge of the rebel-held enclave that includes most of Idlib province and northern Hama province. More than 3 million people live in the area.

The Britain-based Syrian Observatory for Human Rights reported 68 air raids and 19 barrel bombs dropped Saturday on several of towns and villages in southwestern Idlib and Hama province. The area targeted over the past few days overlooks government-controlled areas.

The Observatory described the attacks on the rebel-held areas as the “most intense” since August and said they killed four in Abdeen, west of Khan Sheikhoun town, including two children and a woman.

The raids forced schools to close in Khan Sheikhoun, a town under attack, according to the Observatory.