The Fuerza Pública said that sports events are easy picking for crooks.
Law enforcement began a campaign with the final of the national soccer championship because there have been a flurry of thefts of cell telephones at a prior sports event.
The agency said that the excitement of the game causes fans to take their eyes off their possessions. After one semi-final game, police received 30 complaints of stolen cell telephones, they said.
Reports are not in yet about the thefts at the weekend final game at the Estadio Rosabal Cordero in Heredia, but police had 250 officers on duty.
They have created a cartoon graphic for the campaign.