Two anti-abortion activists behind the filming of videos on fetal tissue procurement by Planned Parenthood were indicted by a Texas grand jury on Monday, while clearing the women’s health group of any wrong-doing.

The videos released last summer led Texas and other Republican-controlled states to try to halt funding for local Planned Parenthood operations, with Republicans in the U.S. Congress also pushing for a funding cut.

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It is unclear what triggered the surprise indictments during the grand jury’s closed-door proceedings, said David Sklansky, faculty co-director of the Stanford Criminal Justice Center and a professor at Stanford Law School.

“It would be quite unusual for the grand jury to change direction without the cooperation and approval of the prosecutor,” Sklansky said. “But pretty much everything associated with this case seems unusual.”