Hah! Well, I nearly saw that ....
What happened was someone racing past and stealing a pensioner's bag as he did so. However, a couple of people hammered after him and got him (not the pensioner, the thief), and the police then turned up to have a word or six with him. Very nice and courteous they were too, as they then offered him a lift in their car, which, despite his protestations that he didn't wish to inconvenience them, they most kindly insisted he accept.