The bomb explosions in Boston during the 117th Boston Marathon on April 15, 2013 had killed 3 people while more than 170 others were injured. (Please click here for the photos)
It is very sad to read about another mass killing in the United States of America.
The victims were eight years old Martin Richard, of Boston, twenty-nine years old Krystle Campbell, of Medford and a Chinese lady identified by the Shenyang Evening News as Lu Lingzi.
The Federal Bureau of Investigation or FBI investigating the area found a mangled pressure cooker and a torn black bag that the FBI said were part of a bomb.
Associated Press reported that FBI believes that at least one bomb and possibly both were built using pressure cookers as the superstructure, black powder or gunpowder as the explosive and ball bearings and nails as additional shrapnel.

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. REUTERS

This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a black backpack that the FBI says contained one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)