US swelters under dangerous heat wave

Firefighters monitor as flames consume brush along Gilman Springs Road during the Rabbit Fire late Friday, July 14, 2023, in Moreno Valley, Calif. (AP Photo/Eric Thayer)

Hikers watch the sunset at Papago Park, Friday, July 14, 2023 in Phoenix. Phoenix hit 112 degrees on Friday, marking the city’s 15th consecutive day of 110 degree-plus temperatures and putting it on track to beat the longest measured stretch of such heat. The record is 18 days, recorded in 1974. Desert residents accustomed to scorching summers are feeling the grip of the heat wave hitting the Southwest this week.(AP Photo/Matt York)

PHOENIX (AP) — A dangerous heat wave threatened a wide swath of the Southwest with potentially deadly temperatures in the triple digits on Saturday as some cooling centers extended their hours and emergency rooms prepared to treat more people with heat-related illnesses.