In a run-down back street in the Northern Quarter of Manchester, England, less than a mile from the arena where a bomb killed 22 people on Monday, is the Muslim Youth Foundation (MYF), a local mosque and community center that runs programs for young people.
Pinned to a notice board in its lobby is a simple three-paragraph message, welcoming all to pray and attend activities at the center. Below, it includes an addendum: "We do not tolerate any kind of extremism or extremist ideologies inside this center." And then, in red type: "We urge everybody to stay within the Islamic and the U.K. laws."
That message has become all the more apt since Monday night, when a suicide bomber detonated an improvised explosive device at the end of an Ariana Grande concert, causing mayhem among the 20,000-strong fans flooding out of the arena.