Investigators in Washington and Boston denied Wednesday that an arrest had been made in the bombing of the Boston Marathon. They had earlier said there was "substantial" progress in the case.
A second letter sent to the U.S. Senate and another intended for President Obama have potentially positive for the lethal poison ricin. The law enforcement official said the letter is similar to one recently mailed to Mississippi Senator Roger Wicker on Tuesday. Capitol police, the FBI and other agencies have continued an investigation
Krystle Campbell, 29 years old, was identified as the second person killed in the Boston Marathon bombings on Monday. Campbell was reportedly near the finish line with her friend Karen Rand, who reportedly was waiting for her boyfriend to finish the race at about 3 p.m. just as the first blast occurred.
The bombs that turned the finish line of the Boston Marathon into a war zone were made of 6-liter pressure cookers with shards of metals, nails and ball bearings.
