BAGHDAD (AFP) - Iraq insisted on Monday that the timetable set last year for the withdrawal of US forces would not be extended, despite a surge in deadly bombings in and around the capital. April was the bloodiest month in Iraq since last September, with 355 people killed in attacks, according to official Iraqi figures. Another four people died in twin bomb attacks near the oil ministry in Baghdad on Monday. The Iraqi government is committed to the dates for the agreed-upon withdrawal of American forces from all the cities and towns by June 30 of this year, government spokesman Ali al-Dabbagh said in a statement. He said Iraq was also committed to the complete withdrawal of all US forces from the country by the end of 2011. These dates cannot be extended and they are in keeping with the process of transitioning and handing over responsibility to Iraqi security forces, according to what was agreed upon, Dabbagh said. The timetable was enshrined in a landmark security pact signed with Washington in November but some US commanders and Iraqi leaders have since hinted that troops might remain in some especially volatile areas past June. Despite an overall drop in violence over the past two years, some parts of the country-including the capital and Iraqs second largest city Mosul-continue to see regular attacks. Last week, a US military spokesman said the question of US troops remaining in Mosul past June was undecided and pointed out that the agreement allows for troops to remain in cities past the deadline if both sides agree. Mondays coordinated midday blasts struck a parking lot near the ministry in downtown Baghdad, killing two civilians and two policemen who were parking their cars and wounding seven other people, security officials said. The explosions struck near a heavily-guarded police academy that has come under repeated attack by insurgents since the 2003 US-led invasion which deposed the dictator Saddam Hussein. Mondays bombings follow a surge in violence in the capital last month that targeted busy markets in mainly Shiite areas of Baghdad, raising concerns about the return of sectarian violence. Statistics compiled by the defence, interior and health ministries showed that 290 civilians, 24 soldiers and 41 policemen were killed in violent attacks across the country in April, and that another 747 people were wounded. The death toll was 40 percent higher than in March because of a wave of attacks, including six car bombs which rocked the capital at rush hour on April 29, killing more than 50 people and wounding dozens more. On Monday, the Iraqi army killed three would-be suicide bombers in a raid on their house in Buhroz, an Al-Qaeda stronghold just south of Baquba, where attacks remain common, defence ministry spokesman Mohammed al-Askari said. The assault was part of a new Iraqi army operation in Baquba, capital of the ethnically and religiously mixed province of Diyala, where repeated military sweeps have failed to wipe out an Al-Qaeda-led insurgency.