Washington, June 11 (RHC)-- A top official at the U.S. Customs and Border Protection agency has been removed amid accusations of failing to investigate abuses and deadly shootings by agents on the Mexican border.

James Tomsheck was replaced as the CBP’s head of internal affairs following a wave of shootings by agents that have killed 28 people since 2010. The victims include at least six Mexican nationals killed on the Mexican side of the border.

Hundreds of immigrants have filed complaints over alleged abuses, but just 14 cases have led to disciplinary action. A report by law enforcement experts earlier this year criticized the Border Patrol’s "lack of diligence" in investigations.

Mark Morgan, the FBI’s deputy assistant director for inspections, will replace Tomsheck on an interim basis.