Some alert citizens are being credited for helping police arrest a bank robbery suspect.

Officers with the South Bend Police Department were called to the 2300 block of South Michigan Street near 1st Source Bank after workers received a call about a man wearing a mask walking toward the branch.

Employees were able to put the building on lockdown to prevent the suspect from entering, according to South Bend Police.

Using the description provided by witnesses, police caught up to the suspect a couple of blocks away.

Cheston Turnipseed, 34, was arrested on preliminary charges of attempted robbery and robbery, according to South Bend Police.

During interviews with detectives, he admitted to the robbery of the 1st Source Bank branch in the 2600 block of Mishawaka Avenue back on May 30, South Bend Police stated.

RELATED: South Bend police searching for bank robbery suspect, May 30, 2017