After they were instructed to resume deliberations Monday, jurors sent a note saying they were “extremely deadlocked.”

One juror said as she left the courthouse that the jury was always split down the middle on the most serious counts, although the jury was composed of only 11 people after one juror was dismissed last week when she told the panel she had come across news about the Schulte case before the trial.

Juror Alexis Anthony said she never thought the evidence was strong enough to convict Schulte of espionage-related charges.

“For me, I never felt the burden of proof was proved,” she said.

Prosecutors portrayed Schulte as a disgruntled software engineer who exploited a little-known back door in a CIA network to copy the hacking arsenal without raising suspicion, in what was said to be the largest leak in CIA history involving classified information.

It was only after the anti-secrecy group WikiLeaks published the so-called Vault 7 leak in 2017 — nearly a year after the theft — that the agency scrambled to determine how the information had been stolen. It identified Schulte, a 31-year-old originally from Lubbock, Texas, as the prime suspect.

Schulte had left the agency on stormy terms after falling out with colleagues and supervisors, and prosecutors described the leak as an act of revenge.

The data dump revealed CIA efforts to hack Apple and Android smartphones and even described efforts to turn internet-connected televisions into listening devices.

“These leaks were devastating to national security,” Assistant U.S. Attorney Matthew Laroche told jurors. “The CIA’s cyber tools were gone in an instant. Intelligence gathering operations around the world stopped immediately.”

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But the defense said the prosecution failed to present a clear case or show how they could be sure Schulte was the culprit.

Even after presenting a month of testimony, 18 witnesses and more than 1,000 exhibits, “the government still is not able to answer for you the very basic questions,” defense attorney Sabrina Shroff told jurors. “There are more questions now than when this trial first began.”

Shroff argued that investigators could not be sure who took the data because the CIA network in question “was the farthest thing from being secure.”

“Hundreds of people had access to it,” she said. “Hundreds of people could have stolen it.”

The mistrial on eight counts injected new uncertainty into a complex case that had been several years in the making. The U.S. Attorney’s Office in Manhattan did not immediately say whether prosecutors would retry Schulte on the most serious charges. The CIA also declined to comment.

Schulte faces separate child pornography charges, but his defense team is trying to to have those counts thrown out due to what it calls “misstatements” the FBI made in applying for a warrant to search Schulte’s New York City apartment.

Prosecutors said Schulte, after being arrested in New York, attempted to leak even more classified information using a contraband cellphone that had been smuggled into the Metropolitan Correctional Center. They said he declared an “information war” and was “prepared to burn down the United States government.”