An 8-year-old Tacoma boy called 911 early Wednesday to report his mother was being beaten by her boyfriend, Tacoma police said.
The boy told a 911 dispatcher that the boyfriend was throwing his mother, who was pregnant, to the ground. He said the man had been drinking all night and might own a gun.
Officers arrived in the 900 block of North Pearl Street about 1 a.m. The boy came outside and the officers could see the mother and boyfriend fighting, police said.
The man was subdued and arrested on suspicion of aggravated domestic violence assault.
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Medical aid was called to treat the woman, who was five months pregnant, for non-life-threatening injuries.
Police said the woman told them she had been choked to the point of unconsciousness.