ANTIOCH -- Two residents were victimized by an armed robber who struck as they left for work Friday morning, taking one man's car after getting his keys and wallet, police said.

The robbery was reported just after 6 a.m. at an apartment complex in the 3900 block of Delta Fair Boulevard, according to Antioch police Lt. Tammany Brooks. A man walking to his truck to leave for work was approached by a suspect who "appeared out of nowhere," Brooks said.

Armed with a silver handgun, the man demanded the victim's keys and wallet, which he handed over. Another resident, also preparing to leave for work, came upon the crime in progress, saw the gun, and tried to run away.

The suspect chased the second man, knocked him down -- he may have struck him with the gun, Brooks said -- and took his wallet. Meanwhile, the first victim went back into his apartment, but when he emerged a few minutes later, his truck was gone.

The man who was pushed to the ground suffered a small cut, but both men declined medical treatment, Brooks said.

The stolen vehicle is a white 2000 Toyota Tacoma pickup truck, license plate 6H69033. Anyone who sees the truck should call 911.

Anyone with information on the case is asked to call 925-779-6939. Tips can also be texted to 274637 (CRIMES) using the keyword ANTIOCH.

Contact Daniel M. Jimenez at djimenez@bayareanewsgroup.com. Follow him at Twitter.com/DMJreports.