The letters arrived in March. Sent anonymously to multiple communities, the letters with words in bold at the top declared that Tuesday, April 3, would become “Punish a Muslim day” in Britain.

Sent to homes, lawmakers and at least one business, the documents detailed a disturbing point-based system that would award attackers for acts of hatred and violence: 10 points for verbally abusing a Muslim; 500 points for “butchering a Muslim using a gun, knife, vehicle or otherwise.”