On the heels of Friday's shooting at an elementary school in Newtown, Connecticut, Mayor Michael Bloomberg is continuing his call for stricter gun restrictions.
Speaking on NBC's Meet the Press Sunday, Bloomberg said President Barack Obama should make gun control legislation his "number one agenda."
"The president campaigned back in 2008 on a bill that would prohibit assault weapons. We have to really question whether military style weapons with big magazines belong on the streets of America in this day and age," Bloomberg said. "Nobody questions the Second Amendment's right to bear arms, but I don't think the founding fathers had the idea that every man, woman, and child could carry an assault weapon."
Bloomberg also said it's important to close the gun show loophole, which allows people who buy guns at shows to avoid the required background checks.
As grieving Newtown residents gather in a local church to mourn the victims, they got a brief scare Sunday.
Police are investigating after a death threat interrupted the noon service at Saint Rose of Lima Church.
One parishioner said someone called in, saying, "I'm going to kill...I'm going to kill."
Worshippers were forced to leave the church, and a SWAT team was ordered in.
Police fully searched the building and said they found nothing dangerous.
"They come to a place like this because they collectively need to be together within that embrace of prayer, search for meaning, some kind of healing," said one person at the scene. "So to interrupt it is a very tragic and difficult thing. But we'll get by it. The people will get by it."
The church will remain closed at least until Monday.
Eight of the families of the murdered children worshipped at the church and were planning to hold funeral services there. The families were coming to the church, which was open 24 hours to allow families to grieve.
The church will be closed until at least Monday.
Meanwhile, police on Sunday afternoon identified the type of weapon used in the shooting.
Police officially identified Adam Lanza, 20, as the shooter and said he used a bushmaster AR-15 assault weapon, with magazines holding 30 rounds per clip, to carry out the massacre.
He was also found with a Glock 10mm and Sig Sauer 9mm.
A shotgun was also found in the car the gunman drove to the school.
The medical examiner said he shot his mother, Nancy Lanza, multiple times in the head in her sleep before going to Sandy Hook Elementary School, where he shot and killed 26 people.
Police said the gunman forced his way inside the school. Sources said he did not have body armor.
He killed six adults and 20 children before shooting himself in the head.
Hundreds of bullets were found at the school.
Police said it's going to take time to put all the pieces together.
"We're pleased with the progress that we're making," said Lt. Paul Vance of the Connecticut State Police. "This is a very long, tedious process, which I've stated. It's going to take many, many man hours to attempt to draw this picture together, to put this puzzle together."
Authorities said the gunman had no criminal history and left no note explaining his motive.
Sources said he smashed the hard drive on his computer to prevent information from being recovered from it.
The father of the gunman, Peter Lanza, released a statement Saturday.
"Our family is grieving along with all those who have been affected by this enormous tragedy. No words can truly express how heartbroken we are. We are in a state of disbelief and trying to find whatever answers we can."
Sheriff Mike Downing gave a statement on behalf of Nancy Lanza's family at their New Hampshire home.
"The family of Nancy Lanza share the grief of the community and nation as we struggle to comprehend the tremendous loss that we all share," the statement said. "Our hearts and prayers are with those who share in this loss. We express our heartfelt sorrow for the incomprehensible loss of innocence that has affected so many. The family requests you respect their privacy at this time of anguish and loss."
One of the questions on everyone's mind is how will children return to school. Sandy Hook Elementary is still a crime scene, but it will also always be the scene of a massacre. The school is also without its leader, as the principal died while trying to save students, according to the superintendent.
Officials said all schools in Newtown will be closed Monday. They said the school board has several plans they are considering for the future, and local police said the elementary school may never reopen.
"It's too early to say, but I would find it very difficult for them to do that," said Lt. George Sinko of the Newtown Police. "But certainly, that's one of the things they'll have to look into."