A rush-hour suicide bomb hidden in a sewage truck killed at least 80 people and wounded more than 300 others in Afghanistan’s capital early Wednesday, officials said.

The powerful explosion occurred at a time when Kabul’s roads were packed with commuters.

A huge plume of smoke rose over the city. Windows were shattered in shops, restaurants and other buildings up to a half-mile from the blast site.

Hamdullah Mohib, the Afghan ambassador to the U.S., was in Kabul at the time of the explosion. “It felt like the house was going to collapse from a massive earthquake,” he told NBC News.