Russia strikes Syrian rebel targets over 'chlorine' attack

"Air strikes were carried out by Russian air force planes," defence ministry spokesman Igor Konashenkov said in comments reported by TASS state news agency.

Russia's defence ministry spokesman said earlier that Syrian rebel fighters used chemical weapons containing chlorine in an attack Saturday on the regime-held city of Aleppo.

Russia carried out strikes after identifying the attackers' positions and finding evidence they could use such weapons again, Konashenkov said.

"As a result of the strikes, all of the rebel fighter targets were destroyed," he added.

Syrian state media and the Britain-based Syrian Observatory for Human Rights monitor reported that around 100 Syrians were hospitalised with breathing difficulties in the regime-controlled city after an attack allegedly using "toxic gas".

The monitor said air strikes then hit the edges of the last opposition Idlib bastion on Sunday, adding that they were most likely carried out by Russia.

Russia's defence spokesman said earlier that the shells fired at residential areas of Aleppo were "filled with chlorine", calling this a preliminary conclusion backed up by the victims' symptoms.

On Saturday evening, "terrorist groups" in an area of the Idlib buffer zone controlled by the Hayat Tahrir al-Sham jihadist group fired grenade launchers loaded with "explosives apparently containing chlorine", Konashenkov said.

Russian military chemists have arrived in the area to help victims and monitor the situation, Konashenkov said.

The defence spokesman said 46 people including eight children suffered from exposure to chemicals and have been hospitalised.

He pointed to repeated warnings from Russia that the White Helmets rescue volunteers in Idlib were staging chemical attacks in order to blame them on regime forces.

During the seven-year Syrian conflict, the West has accused Damascus on a number of occasions of using chemical weapons against the civilian population.

The regime of Bashar al-Assad and its top backer Moscow have consistently denied those claims, pointing the finger at rebels instead.