BAGHDAD — Roadside bombs killed four U.S. soldiers today in separate incidents in Iraq, the military said, in one of the most deadly days for American troops in weeks.

In the first incident, a roadside bomb struck a patrol in southern Baghdad around 10:30 a.m., killing one American soldier assigned to Multi-National Corps Iraq, the military said in a statement.

Then, an improvised explosive device targeting a patrol in northern Iraq at about 11:40 a.m. killed three soldiers also with the Multi-National Corps Iraq, the military said.

The names of the deceased were being withheld pending notification of next of kin.

The death raises to at least 4,343 the number of members of the U.S. military who have died in the Iraq war since it began in March 2003, according to an Associated Press count.