away. and justin timberlake speaks out about his arrest. first, more than 120 million americans across 18 states are under heat alerts, major cities like new york, philadelphia and washington, d.c. breaking records. the dangerous heat index soaring past triple digits. to the west, flood warnings and travel alerts in the nation s heartland, a leave breaking near sioux city, iowa, a state of emergency declared. new details in the mass shooting in arkansas that claimed three lives and left ten people wounded. what we re learning about the suspect and the reaction from those who knew the victims. countdown to the earliest ever presidential debate, how president biden and former president trump are getting ready for the big night, the difference in their strategies. the urgent search for two teens caught in a riptide at a new york city beach, one of the parents speaking out, the incident coming days after a couple drowned in florida and dozens of people were rescued from