A police officer with his companion keeps guard as a Long Island Rail Road train from New York City arrives at the station in Hicksville, New York
Policemen man their post at New York's Times Square after security was boosted following the Boston blastsUnclaimed finish line bags are viewed near the scene in BostonA swat team arrives at the corner of Stuart Street and Dartmouth Street after the blastsFrance ordered police patrols to be stepped up after the Boston blastsNew York Police Department officers gather at the edge of Times Square in Manhattan in NYCMembers of the bomb squad investigate a suspicious item on the road as runners pass near Kenmore SquareUS President Barack Obama talks on the phone with FBI Director Robert Mueller to receive an update on the explosionsFirefighters take their position on Boyltson Street near the finish lineA member of the bomb squad investigates a suspicious item on the road near Kenmore Square in BostonA long line of ambulances wait in a staging area after the explosionsMarathon runners react after the incidentA US flag flies at half mast on the US Capitol in Washington DCA man is loaded into an ambulance after being injured in the blastsCarlos Arredondo, who was at the finish line of the 117th Boston Marathon when two explosives detonated, leaves the sceneThe blood stained feet of a man hang outside an ambulance outside a medical tent located near the finish after the bombs explodedA video screengrab shows a bloodied street in BostonSecurity around the White House was tightened in Washington DC, with US Secret Service and US Park Police officers standing guard on Pennsylvania AvenueMarathon runners disperse after the blastsRunners gather after the explosionsA man caught up in the blast walks through the streets in Boston (Pic: Kenshin Okubo, Boston Daily Free Press)
