West Yorkshire Police have launched a hate crime investigation after anonymous letters threatening acid attacks on Muslims have been posted in Bradford.

The letters which were posted in Hanover Square, in the Manningham area of Bradford makes threatening statements such as “Kill scum Muslims” and  “We are now going to do acid attacks on anyone who wears the funny black masks around your square & Bradford & other places.”

Police carried out extra patrosl over the bank holiday weekend and have said they will be taking the threats “extremely seriously” with increased patrols in Hanover Square.

A West Yorkshire police spokeswoman said: “A thorough investigation has been launched and officers are working with the local community and partners to identify and prosecute those responsible for this despicable crime.

“We understand the impact hate crime and hate incidents can have on our communities and on individuals, and crimes of this nature will not be tolerated.”

Nadeem Murtuja, the chair of racial justice organisation Just Yorkshire, said he was extremely concerned that Muslims were having to shave their beards or remove hijabs as a result of Islamaphobic threats.

“This is a time for calm heads and people in positions of power, locally and nationally, need to become more visible in their stance towards protecting the human rights of all communities, including the Muslim community.”