Authorities say Robert Ramirez was last seen Friday morning near downtown San Antonio.

SAN ANTONIO — A Silver Alert has been issued for Robert Ramirez, 78, who was reported missing in San Antonio, according to the Texas Department of Public Safety.

Ramirez was last seen Friday at 9:55 a.m. in the 200 block of Comal Street near downtown San Antonio.

Law enforcement officials said Ramirez has been diagnosed with a cognitive impairment, and they believe his disappearance poses a credible threat to his health and safety.

Ramirez is described as a Hispanic male with black hair and brown eyes. He is 6 feet 2 inches tall and weighs about 178 pounds.

Ramirez was last seen wearing a blue polo shirt, dark pants and brown slippers.

Anyone who sees Ramirez is urged to call 911 or the San Antonio Police Department at 210-207-7660.