BATON ROUGE - The head of the ACLU Louisiana says serious questions need to be asked whether body cameras were working properly when two white officers fatally shot a black man outside a convenience store.

Baton Rouge police said earlier Wednesday that the bodycam footage became dislodged during an altercation with 37-year-old Alton Sterling. The Justice Department is investigating the shooting.

Louisiana ACLU executive director Marjorie Esman wants to know if the officers were trained in how to properly fasten the cameras. She says right when they were needed the most is when two of them malfunctioned in the same way.

She also says authorities also should investigate whether police could have used some other means of subduing Sterling and "if it was necessary to subdue him at all."