London mayor: A new "horrific terrorist attack"

Another horrible van attack in London overnight — this time outside a well-known mosque, with worshippers marking Ramadan.

• Reuters: "A van plowed into worshippers leaving a London mosque on Monday, injuring 10 people in what witnesses said was a deliberate attack on Muslims."
• "The incident was being treated as a potential terrorist attack said Prime Minister Theresa May, which if confirmed would make it the fourth since March in Britain and the third to involve a vehicle deliberately driven at pedestrians."
• "Police said the suspected van driver, aged 48, had been detained by members of the public before being arrested on suspicion of attempted murder."

Why it matters: This is another incident in a frightening season, foreign and domestic — from the shooting of a congressman to repeated terrorist attacks. "Rage Is All the Rage," columnist Peggy Noonan wrote in The Wall Street Journal this weekend.