LAS VEGAS — Authorities investigating Sunday night’s massacre in Las Vegas now believe the gunman fired from his hotel-suite perch for 10 minutes before he stopped, worried about trying to escape as security and police neared his suite.

A timeline released by police late Wednesday also shows it took 75 minutes between Stephen Paddock’s first shots and when police entered his suite. The shooter sprayed some 200 rounds into the hallway to try to ward off police, who he monitored through cameras he had set up, said Joseph Lombardo, the Las Vegas Metropolitan Police Department sheriff.

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The timeline was cobbled together from sources like closed-circuit television at the country-music festival and police body cameras. The sheriff defended the time it took for police to force their way into Paddock’s suite, saying they moved carefully, clearing other rooms, because he had stopped firing.

The delay “was not undue, it was purposeful,” Lombardo said during a news conference. He indicated the gunman planned to escape, but didn’t elaborate on how.

The rampage left 58 people dead, according to police. Another 489 were injured, Lombardo said, correcting prior estimates of injuries topping 500. He said there has been some double-counting after people were sent to multiple hospitals for emergency help.

An expanded version of this report appears on WSJ.com.

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