OGDEN -- Ogden police and bomb-sniffing dogs searched Shadow Valley Elementary School in Ogden on Tuesday, looking for an explosive device after a threatening letter was found in the school. All the students were evacuated, and parents were called to pick up their children.
The scene resembled an investigation and evacuation of students at Mountain View Elementary School in Layton after a pipe bomb was found on that school's roof Monday.
After every highly publicized incident similar to the April 15 bombing at the Boston Marathon, bomb threats seem to peak nationwide, and Utah is no exception, officials said.
What seems unusual to the public is not unusual to law enforcement officers, who deal "with the worst of the worst every day," said Davis County Sheriff's Sgt. Susan Poulsen.
Regular people become more aware of their surroundings and will call police after an event like the Boston Marathon bombing, Poulsen said, but law enforcement officers are always looking for anything that may seem suspicious.
On Tuesday, after more than 700 students returned to Mountain View Elementary School, some parents brought baked goods, handshakes and hugs for the teachers and administrators to show their appreciation for keeping students safe, said Christopher Williams, Davis School District spokesman.
The district sent a crisis team of counselors to the school in case students, faculty or staff needed to talk.
Williams said he spoke with the school's principal, Don Beatty.
Beatty told students when they arrived Tuesday, "It's a sunny day outside -- let's enjoy it."
Layton Police Lt. Shawn Horton said police are still looking into who put the pipe bomb at the school. They will be going through all of the surveillance video from the school, which will take time.
Horton said if anyone does see something that appears suspicious, such as an unattended backpack or pipes, do not pick them up or move them.
"Call authorities and let them deal with it," he said.
Layton police are also investigating who called Davis Hospital and Medical Center and threatened to bomb the facility Monday night. The facility was put in lockdown for about two hours while officers searched the building.
The Top of Utah is not the only area dealing with bomb threats this week.
U.S. Highway 163 in San Juan County, about 14 miles north of the Utah-Arizona border, was closed Monday after officials received a bomb threat to a tour bus.
Also, the Salt Lake District Attorney's Office filed a second-degree felony terroristic threat charge against George Zinn, 59. They said he sent an email to the Salt Lake City Marathon Marketing group on Friday requesting permission to place bombs at the marathon's finish line Saturday.
Zinn is being held in lieu of $100,000 bail, and officials say he has a history of interfering with police activities.
Police have also kept busy checking objects that have had residents concerned.
On Monday at Northridge High School in Layton, an unattended backpack with gym clothes sent police to that school. A trash bag on a street corner in Clearfield was checked Tuesday morning and found to be just what it seemed.
"We appreciate the public calling us about anything suspicious," said Clearfield Assistant Police Chief Mike Stenquist. "We'd rather find out it's nothing than later on find out there was a problem."
Syracuse Police Chief Garret Atkin said when officers heard Monday about Mountain View Elementary, they went to each school and checked the grounds and buildings as a precaution.
Officers found what looked like a suspicious object on the roof of Bluffridge Elementary, Atkin said.
It was about the same time students were heading home, so the school did not need to be evacuated. The Davis County sheriff's bomb squad was called and determined the object "was a weather experiment someone had put on the roof and had completely forgot about," Atkin said.
On Tuesday, officers made a special point of going to every school again, "just to let people know we are there," Atkin said.
"With the Boston Marathon bombing, it's on the forefront of everyone's mind that there are people out there with evil intentions," Poulsen said.
Dwayne Baird, public information officer with the Department of Public Safety, said all Utah Highway Patrol troopers are trained to look for anything suspicious on the interstates, under bridges, on overpasses and along off- and on-ramps.