A look at what is and isn't known about the London attack

LONDON (AP) — Here's a look at what's known and what isn't about the violence in London that left seven people and three attackers dead:___WHAT HAPPENED?Police say three men drove a van over London Bridge just before 10 p.m. Saturday and struck pedestrians before crashing the vehicle outside a pub. The attackers, wielding blades and knives, ran down a set of stairs into Borough Market, a well-known fruit and vegetable market that's also home to popular restaurants and pubs. There, they sta