Barack Obama,  is set to attend an evening vigil in Newtown, Connecticut, to mourn the dead and console the survivors of a rampage that killed 26 people, including 20 children.

His visit on Sunday to the western Connecticut community comes two days after a man opened fire inside Sandy Hook Elementary School killing 20 boys and girls just six or seven years old.

A Roman Catholic church in Newtown was evacuated on Sunday after a bomb threat was reported by officials during services at the church, which is roughly 1.6km from the site of shooting.

State troopers, police and ambulances were on the scene at St. Rose of Lima Catholic church, according to a Reuters news agency eyewitness.