The incident comes as US President Barack Obama is en route to Newtown for a vigil tonight for victims of the shooting at Sandy Hook elementary school.
A witness told Reuters state troopers and police surrounded St. Rose of Lima Roman Catholic church today and ordered everyone to leave.
The Guardian's correspondent in Newtown reported a "scene just now in Sandy Hook that no one wanted to see," describing:
"The officers entered the building and torchlight could be seen inside. Outside, police in standard uniforms stood around the white building, some with weapons drawn. Three of the police officers stood behind broad trees outside. ... As press and some churchgoers watched, the situation remained the same for around five minutes, before finally the officers in SWAT gear left the building. They walked more casually this time, and the man with a shield held it down by his side."