Boston police officers have taken a man into custody after evacuating the area around the Boston Marathon finish line where two unattended backpacks were spotted, AP reports.
The packs were discovered at around 6:50 p.m., and police told people to avoid the area as a bomb squad investigates.
Photographers from WBZ-TV said they saw a person with one of the backpacks screaming "Boston strong" before the area was cleared.
Police detained the suspicious man and brought him in for questioning, ABC News reports.
The bomb squad detonated at least one of the backpacks just before 9 p.m., but it was unclear what was in it, CBS News reports. An official told NBC's Jay Gray the area was "all clear" and the second bag found belonged to a "media outlet that apparently left it behind."
Police are especially cautious, as three died and more than 260 people were wounded just one year ago, when two bombs exploded near the finish line.
EXCLUSIVE PHOTO: Male suspect in @bostonpolice custody in unattended bags investigation at finish line pic.twitter.com/W4ENWLJybG
— NECN (@NECN) April 16, 2014An Instagram user posted this footage of the alleged suspect walking on the street moments before he apparently dropped a backpack and was arrested by police:
PHOTO: Police just destroyed bag left at finish line. #wbz#BostonMarathonpic.twitter.com/7bEH4Fsdto
— Peter Wilson (@PetesWire) April 16, 2014
While the race doesn't take place until Apr. 21, tributes were held today to mark the somber anniversary.
"Today, we recognize the incredible courage and leadership of so many Bostonians in the wake of unspeakable tragedy," President Obama said in a statement. "And we offer our deepest gratitude to the courageous firefighters, police officers, medical professionals, runners and spectators who, in an instant, displayed the spirit Boston was built on – perseverance, freedom and love."
This story is developing, and will be updated as we learn more.
Correction: An earlier version stated the marathon takes place on Saturday. It doesn't take place until Monday.
SEE ALSO: BOSTON MASSACRE: The Full Story Of How Two Deranged Young Men Terrorized An American City