Masked men used a sledgehammer to shatter a sliding glass door and break into a West Covina home, where they tied up and gagged family members.
The men then ransacked the home and fled, police said. A detailed description of the four men sought by the West Covina Police Department was not available.
The crime occurred about 1:30 a.m. in the 3400 block of South Flemington Drive, police said.
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No injuries were reported. No details were released about what was taken.
Anyone with information on the crime was urged to call police at 626-939-8500.