One of America's largest cinema chains, Regal, is now searching bags of film-goers following several attacks on movie theatres across the US.
Regal's updated policy says it wants customers and staff "to feel comfortable and safe" in its cinemas.
It is not clear when it began, but reports say some people had their bags checked at some of the company's 570 cinemas this week.
Earlier this month, a man attacked cinema-goers in Tennessee with an axe.
He was shot dead by Nashville police, but no-one else was killed.
