A bridge linking two northern states in Brazil collapsed, sending cars and trucks plunging into the river below. A sulphuric acid spill is complicating the rescue operation.

At least one person died in the collapse, which happened as a city councilman who had complained about the bridge's problems was shooting video.

Brazilian authorities are investigating after a bridge collapsed Sunday, killing at least four people and sending trucks loaded with sulfuric acid and pesticides plunging into a river, raising concerns about water contamination.