A gun-toting robber held up a South San Antonio convenience store late Monday night and then fled on foot.

San Antonio police said the suspect walked into the Save N Go store in the 2300 block of SE Military around 10 p.m. and demanded cash from the clerk.

The suspect then fled toward Brooks City Base after stealing an unknown amount of cash.

Police said the store owner's son chased the man across a field, but could not catch him. The clerk gave police a description of the suspect. No injuries were reported.