The Birmingham mosque attacks are not being treated as acts of far-right extremism or terrorism, police have said.
Vandals have struck at least six times at Birmingham mosques in recent weeks.
The attacks have prompted fear among local communities in the aftermath of the terror attacks on two mosques in Christchurch, New Zealand, in which 50 people were killed.
West Midlands Police, who have been backed by West Midlands Counter Terrorism Unit in investigating the attacks, said a 34 year-old man from Perry Barr handed himself into a police station in Birmingham on Friday and was currently detained under the Mental Health Act.
WMP said they were not seeking anyone else in relation to the attacks and were satisfied they were not motivated by right-wing extremism.
They are also not being treated as terror related.
Police have launched a separate investigation after criminal damage was reported at a mosque on Cromer Road, Balsall Heath, on Saturday at 6.30am.
The incident is not being linked to the mosque attacks on March 21.
Assistant Chief Constable Matt Ward said: "We continue to work in partnership with mosques and local communities around the West Midlands.
"There will be a visible police presence at key locations to offer reassurance to our communities and we continue to offer any assistance in providing security advice."
WMP said that anyone with "concerns" should feel able to speak to officers directly or to get in contact with their local neighbourhood teams.
By Helen William
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