FBI probes white powder in letters sent to DC schools

The FBI on Friday is investigating more than three dozen suspicious letters containing a white powdery substance sent to schools in the capital area, leading authorities to race across the city to check for possible threats.

No hazardous substance was found and no illnesses or injuries were reported as a result of the 37 letters found so far at 32 schools, according to the FBI’s Washington field office.

Four letters were found at area postal facilities, an FBI spokesman said.