WASHINGTON (AP) — Two local law enforcement officers stationed in the complex of buildings where a gunman opened fire at former President Donald Trump left to go search for the man before the shooting, the head of Pennsylvania State Police said Tuesday, raising questions about whether a key post was left unattended as the shooter climbed onto a roof.

Pennsylvania State Police Col. Christopher Paris told a congressional committee that two Butler County Emergency Services Unit officers were stationed at a second-floor window in the complex of buildings that form AGR International Inc. They spotted Thomas Matthew Crooks acting suspiciously on the ground and left their post to go look for him along with other law enforcement officers, he said.

Paris said he didn’t know whether officers would have been able to see Crooks climbing onto the roof of an adjacent building had they remained at the window. A video taken by a lawmaker who visited the shooting site on Monday shows a second-story window of the building had a clear view of the roof where Crooks opened fire; it was unclear if the video showed the window where the officers had been stationed.

The Pennsylvania State Police commissioner’s testimony before the House Homeland Security Committee provides new insight into security preparations for the Trump rally in Butler, Pennsylvania on July 13, but raises further questions about law enforcement’s decisions before Crooks opened fire.

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Butler County District Attorney Richard Goldinger, who oversees the emergency services unit, didn’t immediately respond to a text message Tuesday from The Associated Press. A Secret Service spokesperson didn’t respond to questions from the AP, including who gave the command for those officers to leave their post.

The revelation comes amid growing questions about a multitude of security failures that allowed the 20-year-old gunman to get onto the roof and fire eight shots with an AR-style rifle into the crowd shortly after Trump began speaking. One spectator was killed and two others were injured. Trump suffered an ear injury but was not seriously hurt.

Secret Service Director Kimberly Cheatle resigned earlier Tuesday, a day after she was berated for hours by Democrats and Republicans over the agency’s failure to protect the Republican presidential nominee. Cheatle told lawmakers on the House Oversight and Accountability Committee on Monday that the assassination attempt was the Secret Service’s “most significant operational failure” in decades.

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The Homeland Security Committee also had asked Cheatle to testify but lawmakers said she refused. Cheatle’s name was on a card on a table in front of an empty chair during the hearing, which began shortly before her decision to step down became public.

Several investigations into the shooting by the Biden administration and lawmakers are underway. Republican House Speaker Mike Johnson and Democratic leader Hakeem Jeffries said Tuesday they are supporting a bipartisan task force to investigate the attempt on Trump’s life. The House could vote as soon as Wednesday to establish the task force, which will be comprised of seven Republicans and six Democrats.

Local law enforcement began to search for Crooks after they noticed him acting strangely and saw him with a rangefinder, a small device resembling binoculars that hunters use to measure distance from a target. Law enforcement went to look for him but didn’t find him around the building and a local officer climbed up to the roof to investigate. The gunman turned and pointed his rifle at him. The officer did not — or could not — fire a single shot. Crooks opened fire toward the former president seconds later, officials have said.

Cheatle acknowledged that the Secret Service was told about a suspicious person two to five times before the shooting, but there was no indication at that time that he had a weapon. She also revealed that the roof from which Crooks opened fire had been identified as a potential vulnerability days before the rally. Cheatle said Trump would never have been brought onto the stage had Secret Service been aware there was an “actual threat,” but Crooks wasn’t deemed to be a “threat” until seconds before began shooting.

Authorities have been hunting for clues into what motivated Crooks but have not found any ideological bent that could help explain his actions. Investigators who searched his phone found photos of Trump, Biden and other senior government officials and found that he had looked up the dates for the Democratic National Conventional as well as Trump’s appearances. He also searched for information about major depressive disorder.

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Lauer reported from Philadelphia. Associated Press reporters Michael R. Sisak in New York and Kevin Freking in Washington contributed.