Letters sent to Muslims across the country, including in Bradford and Sheffield, have been branded a 'terrorist incident' by Labour MP Naz Shah.
Speaking to ITV Calendar, the Bradford West MP said:
Counter-terrorism police have been called in to investigate the letters, which encourage people to carry out violent acts against Muslims on 'Punish a Muslim Day.'
West Yorkshire Police said it had received a couple of the 'potentially malicious' letters for further analysis to determine the full circumstances and their possible origin. Meanwhile South Yorkshire Police said there have been three reports in the Sheffield area.
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The organisation Tell MAMA, which campaigns against Islamophobic attacks, says it has received reports of people in Bradford, Leicester, London, Cardiff and Sheffield receiving the letters.
Anyone with any concerns about a communication they may have received should contact their local police force.