Update: Troy Newman says that the powder has been identified. “Well the big scare is all over,” he wrote. “Turns out the letter was 90% baking powder and 10% unknown. FBI is looking into the matter. Thanks for all the prayers.”

WICHITA, Kansas, July 6, 2011 (LifeSiteNews.com) - FBI agents are acting quickly to quarantine the office of Operation Rescue after the pro-life group was sent an envelope found to contain suspicious white powder.

Operation Rescue president Troy Newman told LifeSiteNews.com Wednesday afternoon that officials were called in after he opened a letter postmarked June 11 from France, and “a puff of powder came out.”

“We immediately double-bagged it and threw it outside,” he said. “We’re in lockdown.”

Newman said the FBI, police officers and firefighters, including a haz-mat response unit, had arrived at the scene.

Anthrax has previously been used by terrorists who have mailed the highly infectious, life-threatening bacteria in the form of white powder.

Newman says the FBI has rushed a sample away for testing, and that meanwhile he and six other OR employees are quarantined in their office. Officials are cordoning off the entire block from the public, he said.

Developing ...