Two people died and 24 people were injured after two large explosions struck near the finish line of the Boston Marathon on April 15 2013.
The explosions occurred not long after the first of the race’s nearly 27 000 runners had crossed the finish line. The race was halted after the explosions, as was subway service into the area, the Voice of America reported.
A New York City Police Department spokesman said the city has stepped up security around landmarks in Manhattan, including near prominent hotels, in response to the blast.
Boston is a major metropolis located in the northeastern U.S. The marathon is a significant event the city hosts every year.
London police were reviewing their security arrangements for Sunday’s London Marathon, the BBC said.