Clashes erupted in southern Yemen on Friday after an explosive device targeted separatist militants, a security source said.
Air strikes on Syria's northwestern Idlib region stopped on Friday after the government announced it had agreed to a truce following more than three months of deadly bombardment.
A US air strike killed at least eight policeman in Afghanistan's Helmand province, a government official said on Friday, the latest casualties from a rise in air and ground operations against the Afghan Taliban.
A air strike by the Saudi-led coalition against a radio station in Yemen's Houthi-held port city of Hodeidah killed four people on Sunday, residents and medical sources said.
The bombing on a crowded market in rebel-held northern Yemen killed a total of 51 people, according to the Red Cross.
At least 29 children were among those killed in the air raid on Thursday on a bus in a crowded market in Dahyan, Saada province, according to the International Committee of the Red Cross.
The coalition said it had carried out what it called "legitimate military action" in the area targeting Houthi rebels.
An air strike on one of the last holdouts of the Islamic State group in Syria has killed 54 people, more than half of them civilians, a war monitor said on Friday.
The US military said in Washington it had carried out a strike aimed at a senior militant figure in the eastern Afghan province of Kunar.