The FBI and U.S. Postal Inspectors confirm they are investigating the delivery of more suspicious letters in North Texas. They now say the total number of letters is 13, following the discovery of the newest one in North Dallas late Friday afternoon.
The first letters were found on August 5. By 5 p.m. six letters containing white powder had been delivered to locations across the metroplex. By 11 a.m. on August 6 CBS 11 News learned of five additional letters that had been received.
By 5 p.m. on the 6th, the total had risen to 13, according to investigators.
Four additional letters arrived the morning of August 6th. They were delivered to a company in Arlington, the Raytheon in Garland, another aerospace company in Grand Prairie, a Raytheon plant on the property of Texas Instruments in Dallas, and Rocket Air Supply company on 111th Street in Arlington.
Friday afternoon it was learned that two letters were also found at a Raytheon office in the Boston area.
Ramona Layne, with the Raytheon Company, issued a statement about Friday's events that said, "The safety and security of our employees is paramount. Raytheon contacted Dallas emergency services immediately upon discovery of unknown powder substance at two sites, North Dallas and Garland facilities. Employees at both sites are safe and were unharmed."
The powder in all of the letters found as of 5 p.m. Friday had tested as non-hazardous, but is being sent to labs for more testing. The powder in some of the letters found Thursday was corn starch, according to investigators. The others are still being tested.
Early in the afternoon of August 5 CBS 11 News reported that five suspicious envelopes had been received. The letters began arriving that morning and federal officials were busy trying to determine who sent them.
The first case was reported around 11 o'clock at St. Joseph's Catholic Church in Richardson. Richardson fire officials later said there was another incident in their city; that one involving white powder delivered to the First Baptist Church.
Around the same time as the St. Joseph's incident, a letter came into the mail room at Microsoft's offices located in the 7000 block of State Highway 121 in Irving.
The Spenro Industrial Supply Company, in the 1500 block of West North Carrier Parkway, was the first Grand Prairie aerospace company to receive a 'white powder' letter.
Just after 2:00 p.m. police and rescuers were sent to Dallas Love Field Airport, where an envelope was found in Hanger E.
The sixth envelope was discovered at a mosque in Richardson.
There's no word on if all the letters were sent from the same person or location and investigators. While federal officials won't say if the envelopes contained anything besides the white powder, they are investigating if all of the letter deliveries are related, including an addtional one found in the mailroom of the Israeli Embassy in Washington.
