BREAKING UPDATE: At least one person was killed in the explosion at the U.S. Steel Clairton Coke Works plant. LIVE Updates: wpxi.tv/4oqdu7z | WPXI-TV Pittsburgh

BREAKING: New video shows flames and heavy smoke pouring out of a school bus in Penn Hills. No one was injured. More here >>> wpxi.tv/4pAqAP8 | WPXI-TV Pittsburgh

A massive police presence in Pittsburgh overnight stemmed from an incident in Swissvale. One person was taken into custody. What we know: wpxi.tv/3NiMKYL | WPXI-TV Pittsburgh

UPDATE: One of the inbound lanes of Route 51 has reopened. _________________________ ⚠️ MAJOR TRAFFIC ALERT: Route 51 at the intersection of Edgrebrook Boulevard has been shut down for hours, causing massive traffic backups for people heading into Downtown. This is due to a tree that fell onto wires earlier this morning. LATEST here: https://wpxi.tv/3FBYgqD | WPXI-TV Pittsburgh

Dash cam video provided to Channel 11 by Derek Leidemann reportedly shows the moments when multiple cars collided, halting traffic on the Parkway West before the Fort Pitt Tunnel on Sunday. The details >>> wpxi.tv/3HQGK7e | WPXI-TV Pittsburgh

Pittsburgh drivers will be running into extra traffic and detours after the Fern Hollow Bridge closes on Monday. Here's what you need to know before you hit the road. wpxi.tv/43QTL63 | WPXI-TV Pittsburgh

SEVERE WEATHER: Severe storms with strong winds are moving through the area, bringing trees down and knocking out power to thousands of customers. LIVE updates: wpxi.tv/4c5fGL5 TRACK the storms here: wpxi.tv/380to3O | WPXI-TV Pittsburgh

Girtys Run in Millvale surged as severe storms moved through the area. Severe weather LIVE UPDATES: wpxi.tv/43YLdLP Photos: wpxi.tv/3xkZRka | WPXI-TV Pittsburgh

Severe Weather Team 11 continues to monitor the major winter storm heading our way, with significant snowfall expected for the Pittsburgh region. Meteorologist Adis Juklo has the latest. wpxi.tv/3LGXyQ0 | WPXI-TV Pittsburgh