Davis said authorities found at least one other explosive device that they were dismantling.
There was also no sign of a crater typically left by an explosive device, he added.
Police defused a second explosive device in the city centre, which was seriously damaged by the blast.
But the U.S. officials focused mainly on a deadlier version of the improvised explosive device: the explosively formed penetrator.
In October, just a month before King was to return home, he was killed by an improvised explosive device.
Brian Mancini, who lost his right eye after being hit by an explosive device in Iraq in July 2007.
Mr McBean lost an arm and a leg after he stepped on an Improvised Explosive Device in Afghanistan in 2007.
Shrapnel embedded in some patients' skin seemed to be objects from the street, not from any explosive device, he said.
Authorities in Boston found at least one other explosive device that they were dismantling, Boston Police Commissioner Ed Davis said.
He deployed to Iraq, and was serving his second tour when his unit was struck by an improvised explosive device.
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Russia's Federal Security Service said an improvised explosive device, which unknown bombers placed beneath the railroad bed, caused Friday's derailment.
Mr Pack said that officials found an explosive device inside the pipe, as well as another device inside the bunker.
Another spokeswoman for the Interior Ministry said an explosive device may have been on the bus, but authorities cannot be sure.
Syrian troops destroyed an explosive device warehouse and killed and injured a number of terrorists in Homs, state media reported Thursday.
Charles Marshall, 24, of Bramley, was sentenced at Sheffield Crown Court for charges including possession of an explosive device and affray.
Ingram was killed last month by an explosive device hidden in a house that had been used as a Taliban position.
Ranger Aaron McCormick, 22, from Macosquin in County Londonderry was killed by an improvised explosive device (IED) in November last year.
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Paul Maguire admitted the unlawful possession of an improvised explosive device with intent to endanger life or cause serious injury to property.
The U.S. Department of Homeland Security has issued several unclassified bulletins about the use of pressure cookers as part of an explosive device.
Officers did, however, recover components of an explosive device at his home, according to Gene Rubino, spokesman for the Hudson County Prosecutor's Office.
The newspaper said an undercover TSA inspector brought a mock improvised explosive device stashed in his pants through two layers of security last month.
Officers found an "improvised explosive device" at the scene, which led to the evacuation of nearby properties until army bomb disposal experts made it safe.
In December 2012, German police discovered a crude improvised explosive device placed in a bag on a platform at the main railway station in Bonn.
The soldiers who were killed on Thursday had left their Warrior armoured vehicle in the south-east of Basra when an improvised explosive device was detonated.
The 22-year-old from Pennsylvania was returning to his forward operating base after a routine patrol when shrapnel from the explosive device ripped into his Humvee.
Theo was searching a crossroads in the Nad el Ali South district and detected an improvised explosive device which, if detonated, could have killed many soldiers and civilians.
Richard Wolfe, the hospital's chief of emergency medicine, said the man had multiple injuries from what appeared to be both an explosive device and gunshot wounds.
The 23-year-old was badly injured as he stood on an improvised explosive device (IED) as he patrolled with his Royal Irish Regiment colleagues in Helmand province.
Six years ago, Sergeant Wade was serving in the 82nd Airborne Division in Iraq when his Humvee was struck by an IED, an improvised explosive device.
In the Georgian capital, Tbilisi, police defused a "quite powerful" explosive device found in the car of an employee of the Israeli Embassy, Georgia's Interior Ministry said.
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