Man in custody after two backpacks left near Boston Marathon finish line
Shortly before the evacuation, local media posted video of a barefoot male wearing a black veil and a floppy black hat marching toward the marathon's finish line carrying a large, heavy-looking backpack while shouting, "Boston strong! Boston strong!"
"Boston strong" is, of course, the slogan popularized after last year's April 15 bombings at the marathon, which killed three people and wounded at least 260; the two bombs used in that attack were pressure cookers concealed in backpacks.
Earlier Tuesday, the finish line had been packed with mourners marking the anniversary of the attack.
But as of Tuesday evening, police had cleared the site to examine the backpacks.
The bomb squad was on the scene, and police asked the news media not to show live images of the backpacks, citing officer safety.
After investigating, Boston police decided to safely blow up the bags "for precautionary reasons," according to a statement made on the police's Twitter account.
It was not immediately clear whether the bags contained any explosives.