Two pro-gun US senators have called for changes to firearm laws, as the first victims of the 26 victims of Newtown school shootings were buried.
Democrats Mark Warner and Joe Manchin, who have “A” ratings from the National Rifle Association (NRA), now say action is needed after the massacre.
President Obama has held a meeting with three of his cabinet to discuss how the law might change.
Noah Pozner and Jack Pinto, both aged six, were buried on Monday.
They were among 20 children and six adults killed at Sandy Hook school in Connecticut.
Other victims’ funerals will be held throughout the week, and the town has already begun removing Christmas decorations in mourning.
Two adults who were injured in the attack survived are recovering in hospital and would be crucial witnesses as police continue their investigation, it was confirmed on Monday.
Lt Paul Vance said they were recovering and would be interviewed at an appropriate time.
Children who witnessed the attack would also be interviewed – in the presence of parents and professionals – Lt Vance added.
The Sandy Hook gunman was named as Adam Lanza, who took his own life at the end of a killing spree that began with him shooting dead his own mother.