BAGHDAD, Iraq (CNN) -- Roadside bombings in Iraq killed four American troops and seven Iraqis in a flurry of attacks Tuesday corresponding with a Muslim holy month when insurgents regularly step up their fighting.
The attacks, which occurred in Baghdad and several hot spots in northern Iraq, also left 28 people wounded.
The strikes fell during the holy month of Ramadan, considered to be a time of peace and giving for Muslims across the world.
The Americans died when roadside bombings targeted their patrols, the U.S. military said. Three U.S. troops were killed near the Salaheddin provincial city of Baiji in northern Iraq. Another service member was killed in southern Baghdad.
The four were from the Multi-National Corps-Iraq, and their identifications were being withheld pending notification of next of kin.
The killings marked the deadliest day for U.S. troops since June 30 when they pulled out of urban areas as part of a U.S.-Iraqi security agreement.
Also in the Salaheddin region, a bomb hit the vehicle of a police commander in Tuz Khurmato, killing him and three other police, an Iraqi Interior Ministry official said.
Two more police officers were killed and four others were wounded when a bomb struck a police patrol in Taza, near Kirkuk in northern Iraq's Tameem province, the official said.
In June, Taza was the scene of a deadly suicide bombing that killed more than 80 people and devastated most of the town. It was later declared a disaster zone.
In northern Baghdad, one civilian was killed and 12 others were wounded when a bomb targeted a car carrying Ministry of Health employees. The slain civilian was in the vehicle, and the others were bystanders and passengers in the car, the official said.
Also in northern Baghdad, a bombing wounded two police officers, the official said. In Taji, north of Baghdad, four police and four civilians were wounded in a blast, he said.
In the northern city of Tikrit, local police said the Salaheddin province deputy governor survived an explosion that targeted his convoy. Two guards were wounded.
CNN's Jomana Karadsheh and Yousif Bassil contributed to this report.