An Alameda synagogue was vandalized sometime between Wednesday evening and Thursday morning, police said.
Officers went to Temple Israel of Alameda at 3183 Mecartney Road at about 2 p.m. Thursday to investigate.
The glass in the front doors of the building was broken by what appeared to be a rock, Sgt. Erik Klaus said.
Police believe one person is responsible for the vandalism but so far all they know is that the person was wearing all dark clothing.
Klaus did not say whether the attack was a hate crime. However, he said, anytime the property of a religious group is vandalized, "We want to make sure they're protected," he said.