Attacks against security forces and citizens in Iraq Monday killed at least 20 people and wounded 37 others, AFP quoted police and medics as saying.

Lebanese citizen Hussein Nahle was martyred, and four others were wounded in an explosion on Monday that targeted of bus full of Lebanese pilgrims in the Holy city of Samarra, Iraq.

According to Lebanese media, Foreign Minister Adnan Mansour was informed  by the Lebanese charge d'affaires in Baghdad that a bus carrying Lebanese pilgrims was targeted by a bomb blast in Samarra, and that Hussein Nahle, from the southern village of Taybeh, was martyred, and four others were wounded.

In this context, attacks against security forces and citizens in different regions in Iraq killed Monday at least 20 people and wounded 37 others, AFP quoted police and medics as saying.

Three gunmen attacked a police checkpoint on the highway west of Tikrit, killing one policeman and wounding three.

A police patrol chased the gunmen, who abandoned their car and then detonated explosives in it, killing four more police and wounding two, a police lieutenant colonel said.

In the village of Al-Buslaibi, north of Baghdad, a roadside bomb targeting an army patrol killed three soldiers, an army captain and a police lieutenant colonel said.

A car bomb in Khaznah, a village near Mosul in north Iraq killed seven people and wounded 12, while two car bombs near a Husseiniyah, killed five and wounded 20 in the northern flashpoint town of Tuz Khurmatu, police officers and doctors further told the agency.

Monday's violence comes a day after a string of bombings and a shooting killed 19 people.