Police continue to investigate a robbery in an Oak Park office complex on Greenfield Road that occurred three weeks ago.

The robbery was captured on surveillance video and shows a security guard confronting two robbers.

The guard managed to handcuff one of the robbers, but in the process got into a confrontation with the other robber, who used a pencil sharpener as a weapon, according to police.

Both robbers managed to escape.

Police are investigating and ask the public to contact them if they have any information.