EAST ST. LOUIS, Ill. (AP) — A man accused of fatally stabbing two Illinois bank workers and critically wounding a third during a botched robbery may have had some help, according to newly unsealed court documents.

The FBI alleges in a search warrant application that the survivor reported hearing the suspect, James Watts, talking to someone and getting responses on a two-way radio during the bungled May 15 holdup in Cairo, in far southern Illinois. Such a radio was later found in Watts’ alleged getaway vehicle, and a radio charger was found at the house of a man who investigators believe exchanged text messages with Watts and a woman.