"We have extra supervision and an extra security thinking and observations in this area today," Olof Ahlund, inspector at the Stockholm Police, told TV4.
He says people who come to the mosque should feel safe.
Police were alerted to a gunfire at the al-Noor Islamic Center mosque shortly after 4.30pm on Saturday afternoon. About two hours before the attack in Bærum, a person of the same name posted a message on a network forum where he, among other things, paid tribute to the terrorist attacks against mosques in Christchurch, New Zealand in March this year, when more than 50 people were killed. The Norwegian police have confirmed that they know the information.
Security around mosques is also being raised around Oslo.