BAGHDAD — A suicide car bomber crashed his vehicle into a barrier outside a police building in central Iraq on Thursday morning, killing 18 policemen and wounding dozens more, a local councilman said. While in a separate Incident On Tuesday, a car bomb tore through a cafe in Baghdad packed with young men watching a football match on TV, killing at least 16 people.

The blast is the second significant attack in Iraq since the death of Osama bin Laden Monday , while the violence have erupted sharply after the rejection of Iraqi government , which is under High Pressure of the Public for not to ratify the US Iraq Agreement to  let the US troops stay in the country beyond the agreed withdrawal date of 31 December 2011.

Many people here still believe that the foreign forces have brought nothing but bloodshed and destruction to the country. The Iraqi people have urged the Iraqi Government not to extend the presence of the foreign soldiers, saying that they want to see the last foreign soldier leaving their country.

Observers say the US is losing control of Iraq therefore they are doing everything to regain their power and to extend their presence in country.

Iraqi security officials have said they are increasing security in the wake of bin Laden’s killing. Already security is vastly improved since the days when bin Laden’s associates terrorized the country, but Thursday’s deadly attack against security forces underscored how difficult it is for Iraq to wipe out all traces of the insurgency.

A police official said the bomber hit when the officers were assembling in a square in front of the police building for a shift change in the city of Hillah, about 95 kilometres south of the capital Baghdad.

A member of the Hillah city council, Mahmoud al-Murshidi, who spoke to The Associated Press from the hospital, said 18 were killed and 43 people were wounded in the bombing. He said all the casualties were policemen.

A witness at the scene said the blast knocked down the concrete ceiling covering a parking lot where many police cars were located.

The fact that the bomber was able to wipe out so many policemen in one blast immediately raised questions about security at the building.

Hillah is a predominantly Shiite city but its proximity to the Triangle of Death — a mainly Sunni area that at one time was one of the most dangerous in the country — has made it a frequent target of Wahabi extremists.

There was no immediate claim of responsibility for Thursday’s blast, but extremists like al Qaeda in Iraq have often tried to take out Iraqi forces as a way to undermine security in the country.

On Tuesday, a car bomb tore through a cafe in Baghdad packed with young men watching a football match on TV, killing at least 16 people.

Most of the dead and wounded in the cafe were young people. The blast occurred in a Shiite enclave in the former insurgent stronghold of Dora, an area in southwestern Baghdad that saw some of the fiercest fighting of the Iraq conflict.

Nobody has claimed responsibility for that attack either, but Wahabi insurgents have often targeted Shiites, as a way to incite sectarian violence.