A third man is under arrest for the attack on a 12-year-old boy over the weekend.
Topeka Police Monday arrested Angelo Martinez, 23, on a charge of aggravated battery.
Jose Gutierrez, Jr., 24, and Jesse Gutierrez, 21, were arrested Sunday in connection with the incident.
All three men are suspected of stabbing and beating a 12-year-old who was leaving a carnival at the Kansas Expocentre Friday night.
The boy was treated at a local hospital and released.
Topeka Police continue investigating the attack and ask anyone with information to call Detective Hill at 368-9400 or Crime Stoppers at 234-0007.