A man and woman who were said to be friends were found dead after overnight flooding in San Antonio, the city’s police chief said Monday.

A friend alerted authorities about the pair’s disappearance, and another discovered the woman’s body on Monday, as reported by Chief William McManus to NBC affiliate WOAI in San Antonio.

The man was found roughly 100 yards downstream along a section of Salado Creek near San Antonio International Airport, the chief said.

San Antonio experienced over 4 inches of rain by 7 a.m. Monday, according to the National Weather Service. Data indicates that 2 inches fell in just a three-hour period late Sunday night.

“Both of them, we believe, got washed up in the water last night or this morning,” McManus said. “Apparently, they were friends.”

He added that the two “appear to be” homeless.

The identities of the individuals have yet to be revealed, and the Bexar County Medical Examiner’s Office did not provide any information in response to inquiries Monday evening.

McManus said the deaths are under investigation.

Salado Creek, located north of the city center, is known for its homeless shelters and tunnels, according to the chief. Part of this historic creek, the site of a significant 1842 battle against Mexican troops, has been redeveloped into a “greenway” for pedestrians and hikers.

The area was placed under a federal flood watch from overnight into the morning, with meteorologists citing that rainstorms resulted from a “frontal boundary” where warm and cold air masses meet, forming a typical setup for heavy rainfall.

The region was expected to remain dry through Friday after the last of the rain-producing clouds move east on Monday, the weather service said.