WASHINGTON U.S. President Joe Biden on Thursday said the nation is mourning after "another senseless and tragic mass shooting" in which 18 people were shot to death in Lewiston, Maine, and urged Republicans in Congress to help enact stronger gun laws.

"Far too many Americans have now had a family member killed or injured as a result of gun violence. That is not normal, and we cannot accept it," Biden said in a statement.

(Reporting by Doina Chiacu; Editing by Chizu Nomiyama)