Colombia officials have tied a grenade attack to a local gang's extortion efforts
An explosive was tossed from a motorcycle Tuesday in Barranquilla
At least 14 people, including a minor, suffered non-life threatening injuries
The Barranquilla Metropolitan Police have a person of interest that it is looking into who leads a local gang and is currently in prison
The government has offered a $14,000 reward for information leading to the arrest of the two individuals who were on the motorcycle