LAHORE, Pakistan — Teams of gunmen launched a deadly near-simultaneous attack on three law enforcement facilities in Pakistan's eastern city of Lahore on Thursday, a major escalation in an audacious wave of terror strikes as this U.S.-allied, nuclear-armed country prepares for an offensive in a Taliban and Al Qaeda stronghold. At least seven people died in a gunfight with police at a federal building, 10 others were killed at a police academy, and a police constable was killed in an attack on a commando facility, officials said as the city plunged into chaos. In the Taliban-riddled northwest, meanwhile, a homicide...