Mario A. Prado, 19, of the 400 block of St. Charles Street, Elgin, was arrested by Elgin police on charges of unlawful possession of a firearm by a street gang member, possession of a firearm without a firearm owners identification card, possession of a firearm with a defaced serial number, possession of a firearm under the age of 21, unlawful contact with a street gang member and resisting a police officer following an arrest Tuesday, Sept. 27, 2011. Updated: September 29, 2011 2:23AM Gun charges filed: A known gang member was charged with several gun violations including aggravated unlawful possession of a weapon by a gang member, after officers found a loaded sawed-off shotgun up his sleeve Tuesday night, police said. Mario A. Prado, 20, of the 400 block of St. Charles Street, Elgin, was stopped by police at National and Raymond streets about 7 p.m. while driving with another known gang member, police said. Prado also was charged with possession of a firearm without a firearm owners identification card, possession of a firearm with a defaced serial number, possession of a firearm under the age of 21, unlawful contact with a street gang member and resisting a police officer. “The Elgin Police Department will continue to aggressively pursue gangs — especially with our gang and drug units,” said Police Chief Jeff Swoboda. “We’re sending a very clear message: Gangs and gang activity will not be tolerated in our city.” Prado was in the Kane County jail Wednesday in lieu of $250,000 bond; he is to appear in court Oct. 6.