Scottish police say the killing of a Muslim shopkeeper who wished Christians a happy Easter is being investigated as "religiously prejudiced."

Vigils were held Friday night in memory of 40-year-old Asad Shah, who was killed Thursday night in Glasgow.

He had apparently posted messages on Facebook calling for religious harmony: "Good Friday and very happy Easter, especially to my beloved Christian nation x!"

Police say a 32-year-old man has been arrested in connection with Shah's death. The suspect, who police say is Muslim, has not been identified or charged.

Scottish First Minister Nicola Sturgeon joined the vigil in support of Shah and his family. Many lit candles and left flowers.

The police promise a full investigation into Shah's death.