Suicide attack kills at least 6 civilians south of Baghdad

Iraqi federal police guard Shiite pilgrims marching toward Karbala for the Arbaeen ritual in Baghdad, Iraq, Monday, Nov. 14, 2016. The holiday marks the end of the forty day mourning period after the anniversary of the martyrdom of Imam Hussein, the Prophet Muhammad's grandson in the 7th century. (AP Photo/Ali Abdul Hassan) (The Associated Press)

Shiite pilgrims march to Karbala for the Arbaeen ritual in Baghdad, Iraq, Monday, Nov. 14, 2016. The holiday marks the end of the forty day mourning period after the anniversary of the martyrdom of Imam Hussein, the Prophet Muhammad's grandson in the 7th century. (AP Photo/Ali Abdul Hassan) (The Associated Press)

Iraq's Interior Ministry says a suicide attack south of Baghdad has killed at least six civilians.

Ministry spokesman Brig. Gen. Saad Maan says six suicide bombers tried Monday to infiltrate the holy Shiite city of Karbala, but security forces managed to kill five of them. Maan added that the sixth bomber broke into a house where he blew up himself, killing six and wounding six.

Hundreds of thousands of faithful Shiites have been walking to Karbala to commemorate the end on Sunday of the 40-day mourning period of the seventh century death of Imam Hussein, Prophet Muhammad's grandson. The city is located is some 90 kilometers (55 miles) south of Baghdad.

No group claimed responsibility, but suspicion fell on Sunni religious extremists who consider Shiites as heretics.