Authorities said two "associates" helped Austin Robert Drummond, who is wanted in the deaths of four people whose bodies were discovered after an infant was found abandoned.
The quake's epicenter was in Hasbrouck Heights, New Jersey. No injuries or structural damage was reported shortly afterward, said Jonathan Tytell, a geophysicist at the USGS.
Richardson, an Olympic silver medalist in the 100-meter, was arrested last weekend. She ran the opening round of the U.S. Track and Field Championships on Thursday.
The CPB's closure ends nearly six decades of fueling the production of renowned educational programming, cultural content and emergency alerts about natural disasters.
Detectives said the man had planned to detonate the bombs when the sheriff's office arrived to arrest him on suspicion of threatening public officials.
