Syrian government forces and Iranian militiamen came under attack shortly after midnight in the northern province of Aleppo. One of the jihadi groups involved in the assaults is linked to al-Qaida.
Jihadi militants killed 22 Syrian government soldiers and allied Iranian militiamen on Saturday in two synchronized attacks in northern Syria, a British-based war monitor said.
The Syrian Observatory for Human Rights said al-Qaeda's former Syria branch, Hayat Tahrir al-Sham (HTS), and its ally, Hurras al-Deen, also wounded 30 soldiers and militiamen in the assaults in the northern province of Aleppo.
The jihadis first attacked government positions in a rural area of southern Aleppo in the early hours of Saturday morning. A second suicide bombing attack against government and Iranian forces in southwestern Aleppo occurred shortly thereafter.
Government troops and Russian aircraft responded by bombing jihadi positions, killing eight militants and five civilians, the Observatory said.
Soldiers loyal to the regime also shelled rebel positions in Hama and Idlib provinces in retaliation, according to Syria's official news agency.