Editor's Note: Story updated March 19, 2018, to reflect new information.

State and local officials said Friday that the cables supporting the deck of the pedestrian bridge at Florida International University near Miami were being tightened after a stress test when the bridge collapsed over traffic on March 15, killing at least six people.

Miami-Dade Mayor Carlos Gimenez said crews had conducted the stress test on the span earlier in the day, and Sen. Marco Rubio tweeted that  engineering firm Figg Engineering had ordered the tightening of cables that loosened, the Associated Press reports. “They were being tightened when it collapsed,” Rubio said.

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