Rebel rocket fire on government-held districts of Syria's Aleppo killed at least four civilians Tuesday but an AFP correspondent reported no regime air strikes on rebel areas as ceasefire efforts intensify.

More than 250 civilians have been killed in Syria's second city since April 22 in an upsurge of violence that has prompted a flurry of diplomacy by Russia, the United Nations and the United States to rescue a teetering February truce between the government and non-jihadist rebels.

A child was among at least four people killed in the rebel bombardment, the Syrian Observatory for Human Rights monitoring group said.

State news agency SANA put the death toll at six and said 37 people were also wounded.

The AFP correspondent said the rebel-held east of the city was quiet and the Observatory also reported no new air strikes in the area.

Moscow has faced mounting pressure from Washington to rein in air raids by its Damascus ally as the civilian death toll has mounted and after a hospital and three clinics were hit.

There were some ground clashes during the night along the front line that has divided Aleppo since rebels seized eastern districts of the city in 2012.

UN envoy Staffan de Mistura was in Moscow on Tuesday for talks with Russian Foreign Minister Sergei Lavrov on efforts with Washington to agree a new monitoring mechanism to shore up the ceasefire.

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