BAGHDAD, Oct. 16 (Xinhua) -- Three people were killed and six others wounded on Sunday in a suicide bomb attack targeting a Shiite mourning tent in the Iraqi capital of Baghdad, a police source said.

The attack occurred before noon when a suicide bomber detonated his explosive vest at a mourning tent in the Shiite neighborhood of Karrada in southern Baghdad, said the source on condition of anonymity.

The tent was set up for Shiite Muslims to commemorate the death of Imam Hussein, one of the Shiites' twelve most revered Imams, who was buried in Karbala, some 110 km south of Baghdad.

The Shiite Muslims used to observe the climax of their mourning on Ashura, which marks the death day of Imam Hussein, and will continue the ritual till the Arbaeen, or 40 days after the Imam's death.

The bombing came a day after another suicide bomb attack targeting a mourning tent in the Shiite neighborhood of Shaab in northeastern Baghdad, which left 32 people killed and some 60 others injured.

No group has so far claimed responsibility for Sunday's attack, but the Islamic State (IS) militant group claimed responsibility for Saturday's deadly bombing in a statement, of which the authenticity could not be independently verified.

However, the IS group, in most cases, is responsible for such suicide attacks targeting areas where crowds of people gather, including markets, cafes and mosques across Iraq.

Terrorist acts, violence and armed conflicts killed 1,003 Iraqis and wounded 1,159 others in September across Iraq, the United Nations Assistance Mission for Iraq said.

Many blame the current chronic instability, cycle of violence, and the emergence of extremist groups, such as the IS, on the U.S., which invaded and occupied Iraq in March 2003.