He made the remarks after an assailant attacked a group of Muslims with his car.
Qassemi also called for more vigilance against such moves to eradiate them.
At least one person has died and ten others are injured in an attack on Muslims leaving a London mosque in what Britain's largest Muslim organization said is a "violent manifestation of Islamophobia."
The British police on Sunday night confirmed that one man was pronounced dead at the scene and at least eight were injured after a vehicle rammed into worshipers coming out from the mosque in the Finsbury Park area of north London.
The injured were taken to hospital; two people were treated at the scene for minor injuries, police said in a statement.
The 48-year-old male driver of the van "was found detained by members of the public at the scene and then arrested by police," the police statement said.
"He has been taken to hospital as a precaution, and will be taken into custody once discharged.
He will also be subject of a mental health assessment in due course," it added.
“Due to the nature of this incident extra policing resources have been deployed in order to reassure communities, especially those observing Ramadan,” police said in the statement.