HARTFORD, Conn. (AP) — Connecticut's governor has signed into law some of the country's tightest gun restrictions in response to December's shooting massacre at a Newtown school. The measure adds more than 100 firearms to the state's assault weapons ban and outlaws the sale of large-capacity ammunition magazines similar to the ones used by the gunman who killed 26 people inside Sandy Hook Elementary School. Gov. Dannel P. Malloy, a Democrat, signed the bill at a ceremony Thursday, several hours after it won approval in the General Assembly. Some aspects take effect immediately, including background checks for all firearms sales. President Barack Obama plans a trip to Connecticut on Monday to step up pressure on Congress to pass federal gun-control legislation.