Opponents of a new gun control measure in Maryland filed a lawsuit in U.S. District Court on Thursday that seeks to stop the law from taking effect on Oct. 1. Maryland Gov. Martin O'Malley signed the new law in May. It gives the state some of the nation's tightest gun laws.
Part of the law requires people to submit fingerprints to the state police to get a license to buy a handgun. In addition, the law adds 45 guns to a list of banned assault weapons and limits handgun magazines to 10 rounds.
O'Malley, a Democrat, proposed the bill in response to the December shooting in Newtown, Conn., where a gunman killed 20 children and six adults.