A roadside bomb killed three American soldiers and an interpreter north of Baghdad, the US military said Wednesday, and Iraqi police reported 14 Shi'ite gunmen were arrested after fighting south of the capital. In Baghdad, meanwhile, American soldiers using specially trained dogs sifted through the wreckage Wednesday of an office in Sadr City where a bomb killed 10 people, including four Americans working to restore local government in the former Shi'ite militia stronghold. The roadside bombing occurred about 10:45 p.m. Tuesday in Nineveh province, where al-Qaida in Iraq and other Sunni extremist groups remain active. The US statement contained no further details. Their deaths brought to at least 4,109 the number of US military members who have died in the Iraq war since it began in March 2003, according to an Associated Press count. At least 25 service members have died this month. May's death tally of 19 was the lowest monthly toll of the Iraq conflict.