BAGHDAD, Iraq - The number of American troops killed in Iraq in October reached the highest monthly total in a year Thursday after four Marines and a sailor died of wounds suffered while fighting in the same Sunni insurgent stronghold.

  The U.S. military said 96 U.S. troops have died so far in October, the most in one month since October 2005, when the same number was killed. The spike in deaths has been a major factor behind rising anti-war sentiment in the United States, fueling calls for President Bush to change tactics.

  In other violence, 12 police officers were killed in fighting with suspected militia gunmen in Baqouba, northeast of Baghdad, officials said. Eighteen militants also were killed.

  The deadliest month for U.S. forces in Iraq was November 2004, when military offenses primarily in the then-insurgent stronghold of Fallujah, 40 miles west of Baghdad, left 137 troops dead, 126 of them in combat. In January 2005, 107 U.S. troops were killed.

  Polls show a majority of Americans are opposed to Bush's handling of Iraq, and at a news conference in Washington on Wednesday, he indicated he shared the public's frustration even as he pushed back against calls for troop withdrawals.

  I know many Americans are not satisfied with the situation in Iraq, Bush said. I'm not satisfied either.Gen. William B. Caldwell, the U.S. military spokesman, said there had been a marked decrease in violence in Baghdad since the end of Ramadan, the Muslim month of fasting, earlier this week.