By Li Hongmei

United Nations Secretary-General Ban Ki-moon today condemned the bombing at the Boston Marathon, calling "this senseless violence... all the more appalling for taking place at an event renowned for bringing people together from around the world in a spirit of sportsmanship and harmony."

Speaking at a ceremony at UN Headquarters in New York commemorating the 19th anniversary of the Rwanda genocide, Mr. Ban said that although reports on the incident were still coming in, it was already known that there are dead and wounded.

"As more details emerge I am sure we will return to this with a more formal statement," he added, expressing his deepest condolences to the families of the victims and wishing those wounded a speedy recovery. "But for now I just wanted to say that my thoughts are with everyone in Boston."

Two bombs struck near the finish line of the Boston Marathon on Monday, turning a celebration into a bloody scene of destruction.

The blasts threw people to the ground, killing two and injuring dozens.

Hospitals reported at least 110 people being treated, at least eight of them in critical condition and 14 in serious condition. At least eight of the patients are children.

"Any responsible individuals, any responsible groups, will feel the full weight of justice," President Barack Obama vowed.

Boston "is a tough and resilient town," he said, adding that Americans will stand by Bostonians "every single step of the way."