Two opposition groups have launched an attack on pro-regime forces killing at least 22 and wounding 30 others in the northern province of Aleppo early on Saturday, a war monitor said. Britain-based Syrian Observatory for Human Rights said the attack was launched by Hayat Tahrir al-Sham and Al-Qaeda-linked Hurras al-Deen group. The attacks in the southern and southwestern countryside of Aleppo province were launched shortly after midnight and triggered clashes that continued until dawn, Observatory head Rami Abdel Rahman noted. Eight militants were killed, he added. Russia aircraft also carried out strikes in neighboring Hama province early on Saturday, killing five civilians, the Observatory said. Also on Friday, Russian strikes killed 10 civilians in Idlib and Hama provinces, it added.