JEFFERSONTOWN, Ky. — A gunman fatally shot a man inside a Kroger and then killed a woman in the grocery store’s parking lot before exchanging gunfire with a bystander, police said. Officers then captured the suspect as he tried to flee.Gregory Alan Bush, 51, was booked early Thursday on two counts of murder and 10 counts of felony wanton endangerment, according to Louisville Metro Department of Corrections records.Jeffersontown Police Chief Sam Rogers said in an initial news conference at the scene that “we have no idea” what motivated the shootings. The FBI later announced that it “is evaluating the evidence to determine if there were any violations of federal law.”Rogers said the suspect fired multiple rounds at the man inside the store and then shot the female victim multiple times out in the parking lot at about 3 p.m. on Wednesday. Both died at the scene. A citizen armed with a gun engaged the suspect, trading gunfire in the parking lot, but no one was hit, Rogers said.Bystander video shows a white man in a distinctive neon-yellow shirt trying to get away. He’s recorded driving out of the lot while an officer chases after him on foot. Other videos show police making the arrest.