A mosque was placed on lockdown after worshippers received a threatening letter with a mystery white powder inside, witnesses said.
Police set up a cordon around the Didsbury Mosque and Islamic Centre in Manchester, which was previously attended by Manchester Arena suicide bomber Salman Abedi.
However, a spokesman for Greater Manchester Police said the incident is being treated as ‘low risk’.
It is not yet known what the white substance was and if it is harmful.
Emergency service workers wearing protective suits and breathing apparatus could be seen coming in and out of the building.
In May, a police mobile video unit was deployed outside the mosque after it emerged that Abedi had worshipped at the mosque with his family.
A Greater Manchester Fire and Rescue Service spokesperson said: ‘Crews were called to Didsbury Mosque on Burton Road at 11.52am.
‘We were called to assist the police following reports of an incident involving a letter or suspect package. The area has been cordoned off and firefighters are still at the scene supporting GMP.’
A Greater Manchester Police spokesman said: ‘Police were called to the Manchester Islamic Centre, on Burton Road, in Didsbury at 11.40am. Officers received a call that there had been a threatening letter sent to the Islamic centre.
‘Police attended and, together with the fire brigade, are currently accessing the letter.
‘At this stage it is being treated as low risk. Officers are expected to remain at the scene for the rest of the day.’