Boston Marathon postponed from April 20 to September 14

Reuters

The historic race, first contested in 1897, is the world's oldest annual marathon.

Massachusetts governor Charlie Baker declared a state of emergency on Tuesday and marathon organizers met with Boston Mayor Martin Walsh to decide on how best to proceed.

"On matters of public health and safety we take our guidance from the officials entrusted with protecting the public in this area," said association chief executive Tom Grilk.