AUSTIN (KXAN) -- The Austin Police Department has asked for the public's help in its search for a missing 40-year-old who was last seen Saturday afternoon in downtown Austin, according to a press release from the agency. Police identified the missing man as Daniel Choi, and said he was last seen in the 600 block of Davis Street around 1:04 p.m. His friends found his cellphone on the ground at Caesar Chavez and South First Street around 5:45 p.m., APD said in a news release. APD said it has concerns for Choi's disappearance, as he needs undisclosed medications. The Austin Police Department is seeking the public's help to find a 40-year-old missing man last seen in downtown Austin Saturday (Courtesy APD) Choi is described as an Asian man, 5 feet 8 inches, 130 pounds, has straight black hair and has limited use of his right arm, according to APD. He was last seen wearing blue swim shorts with bird print on them and a blue T-shirt. If anyone sees Choi, they are urged to call 911 immediately or the APD Missing Person's Unit at 512-974-5256.