Baghdad (CNN) -- A rash of bombings and other attacks shook the northern Iraqi city of Mosul, Diyala province, and the Baghdad area on Monday, killing at least 57 people and injuring many others, authorities said.
In Mosul, police appeared to have been targeted in a series of deadly attacks, starting with a suicide vehicle bombing at a security checkpoint.
That blast killed at least nine federal police officers, police and health officials in Mosul said.
The attack occurred at al-Sawas square in central Mosul, about 250 miles (400 kilometers) north of Baghdad.
Overall around Mosul on Monday, at least 36 people were killed and 122 wounded in car bombings, shootings and clashes, the officials said.
Near Baghdad, at least 15 people were killed and 30 were wounded when three bombs targeting a vegetable market went off in quick succession, Iraqi parliament member Husain Hamham said.
The incident occurred in Jadidat al-Shat in Diyala province, more than six miles (10 kilometers) north of Baghdad.
There was more violence in or near Baghdad proper.
A roadside bomb hit a police patrol in the town of Al-Madaan, just south of the capital. As security officials arrived to investigate, a suicide bomber attacked, killing at least three officers.
And in the Sadr City area of Baghdad, two bombs exploded outside a restaurant, killing another three people.
Iraq has been beset with political and sectarian violence in recent months.
Iraqi and international leaders fear that tensions between Sunnis and Shiites could escalate and restart the full-blown sectarian war that raged last decade.