Unknown assailants have vandalized the Kadıköy Protestant Church in Istanbul, by writing “Allah 1” on its door.

An investigation has been launched into the incident, but no one has been yet caught, Mezopotamya news agency reported on Dec. 31.

Artı Gerçek journalist Murad Mıhçı also reacted against the vandalization, sharing a picture of the defaced church on Twitter.

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Two other churches in Kadıköy were also reported to have been defaced.

Read more: Duvar English