Three workers died when an explosion caused a roof collapse at a ConAgra Foods Inc (www.conagrafoods.com) processing plant in North Carolina, and more than 40 people were injured, according to a report by Reuters (www.reuters.com).

The 500,000-square-foot (46,000-sq-meter) plant in Garner, south of the state capital of Raleigh, employed 900 people in three shifts and made Slim Jim meat sticks, ConAgra said.

Tuesday”s explosion started a fire and blew out a wall that fell onto a row of parked cars, crushing them. People at the scene reported a strong smell of ammonia fumes.

The cause of the blast was unknown.

For the full Reuters report on this story, click here.