LONDON — Police officers and counterterrorism officials in Britain were investigating attacks on four mosques overnight Thursday, including one in which a man took a sledgehammer to smash the windows of a house of worship in Birmingham, England.
After the authorities received reports of the sledgehammer attack in north Birmingham, a similar episode was reported a few miles away, according to the West Midlands Police. Officers later discovered damage to two other sites nearby, in an area with a large Muslim community.
“The motive behind the attacks, which are being treated as linked, is yet to be established, but West Midlands Police and the West Midlands Counter Terrorism Unit are investigating,” the statement said.
Birmingham is one of Britain’s largest cities and home to one of its biggest Muslim communities: More than one in five people there have declared Islam as their religion.
The attacks came after a massacre at two mosques in Christchurch, New Zealand, during Friday Prayer last week left at least 50 people dead, and the British police said they had been providing reassurance and support at mosques in Birmingham.
[Read: Profiles of the victims in the New Zealand attacks.]
On Thursday, Britain’s home secretary, Sajid Javid, said on Twitter that it was “deeply concerning & distressing to see number of mosques have been vandalized in Birmingham overnight.”
“Let me be clear — hateful behavior has absolutely no place in our society and will never be accepted,” he wrote in the post.
Majid Mahmood, a member of the local council in the area where the attacks took place, posted videos of the cleanup on Thursday. He called on the police to step up patrols after the attacks in New Zealand.
“The Muslim community is fearful of more attacks,” he wrote on Twitter.
Muslims make up slightly more than 4 percent of the population of the United Kingdom, according to the most recent national census, conducted in 2011. The growing Muslim population has been the subject of an increasing number of hate crimes, according to Home Office statistics. There were 80,393 such offenses in 2016-17, compared with 62,518 in 2015-16. That increase, 29 percent, was the largest since the Home Office began recording figures in 2011-12.