Ava DuVernay, who directed the Oscar-nominated civil rights movement film Selma, suggested on Tuesday that the dashboard camera footage of Sandra Bland’s arrest earlier this month was altered.

“I edit footage for a living. But anyone can see that this official video has been cut,” DuVernay posted on Twitter, while linking to an article by journalist Ben Norton listing what appears to be discrepancies in the footage released earlier in the day by the Texas Department of Public Safety.