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Shortly after ceremonies ended Tuesday to commemorate the one year anniversary of the Boston Marathon bombing, two unattended backpacks in the area of the Boylston Street finish line came to the attention of police, who evacuated the neighborhood.

The Boston Police Department called in the bomb squad and performed what is known as a "controlled disruption" of the bags, police department spokesman David Estrada said.

Police also arrested an adult male who is the owner of the bags, Estrada said.

Estrada was not sure what might have been in the backpacks and he was not sure what method was used to destroy the bags. "They have different methods – sometimes water cannon, sometimes a little bit of explosives."

The neighborhood was still cordoned off at about 10 p.m. Tuesday night, according to Estrada. The incident happened at about 6:50 p.m.

Earlier, crowds gathered to remember the four who died in connection with the April 15, 2013, bombing at the finish line and the hundreds who were injured. Many who had come downtown to take part in the ceremony had left the downtown area when the backpack incident took place, Estrada said.

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