A window was smashed on successive days at a synagogue in Belfast, Ireland.
The vandalism at the Belfast Hebrew Congregation took place on Friday night and the following day, the BBC reported.
In the latter incident, the replacement window was shattered.
Police are treating the vandalism as a religious hate crime.
Ulster Unionist leader Mike Nesbitt said it was “totally unacceptable” for places of worship to be targeted, the BBC reported.
Gerry Kelly, a member of the legislative assembly, condemned the attack.
“There can be no place for attacks on any place of worship, regardless of the religion or denomination,” Kelly said, according to Belfast’s News Letter. “The local Jewish community makes a valuable contribution to our society and there is no justification for hate crimes.”
It was not clear whether the attack was related to Israel’s operation in the Gaza Strip.