Iraqi police say 14 people were killed in separate attacks in the Iraqi capital on Tuesday.

Police say the deadliest attack was the bombing of a bus station in Baghdad's Mashtal neighborhood that killed seven people.

In the capital's northern neighborhood of al-Qahira, four people were killed and eight others were wounded in a roadside bomb explosion.  Other, smaller attacks were reported around the city.

The violence follows a string of bombings Monday that killed 10 people.

Also Tuesday, the U.S. military in Iraq said Iraqi army soldiers seized numerous weapons in Baghdad's Sadr City during the past few weeks.

In other news, Iraq's Sunni vice president says his country should hold a national referendum to determine whether U.S. troops should remain in Iraq until 2012.

In a statement Tuesday, Vice President Tariq al-Hashemi said a security agreement determining U.S. troop presence in Iraq should not pass without the approval of Iraqis.

U.S. and Iraqi officials have been trying to finalize a deal that would allow the U.S. military to remain in Iraq after a United Nations mandate expires at the end of December.

Iraq is proposing changes to a draft agreement to give Baghdad more authority over U.S. troops and guarantee that Iraqi territory will not be used to attack other countries.

Some information for this report was provided by AFP and Reuters.