DAMASCUS, Syria — A string of bombings, including a suicide attack claimed by the Islamic State group, struck in and around several Syrian cities on Monday, killing at least 43 people, mainly in government-controlled areas.

The SANA news agency reported blasts around the coastal city of Tartus, the central city of Homs, the suburbs of the capital Damascus, and the northeastern city of Hasakeh. The attacks were timed closely together, but authorities have not determined whether they were linked. The Islamic State group claimed responsibility for the blast in Hasakeh.