McALLEN, Texas — A grand jury will consider the case of two Guatemalan immigrants killed when a Texas state trooper in a helicopter opened fire to stop a tarp-covered truck that authorities thought was ferrying drugs near the Mexico border, a prosecutor said Wednesday.

Hidalgo County District Attorney Rene Guerra said after meeting with Texas Rangers that the case ‘‘will be taken to a grand jury, there’s no doubt about that.’’ He added that he asked the investigators to tell the state Department of Public Safety that shooting from helicopters should be suspended until policies are reviewed.