BASEL, Switzerland (AP) -- The site of an ATP tournament was closed for more than hour Tuesday after guards discovered a letter feared to contain anthrax. Authorities said they found no trace of the substance.
The problem was cleared up in time to allow the opening round of the Swiss Indoors to begin on schedule at St. Jakobshalle. The tournament features some of the top players on the men's tour.
Rolf Klaus, state chief of chemical security, said the package was analyzed at the Basel city lab and no spores in the powder were detected.
"But we feel it's a kind of drug and are still testing to see what kind," Klaus said.
Marcos Mueller, chief of the state's civil defense, said two agents for a private security firm found a letter in the arena lobby Tuesday morning.
"When one of them opened it, powder trickled out," Mueller said. He said the powder was brought to the main entrance and tournament security officers were alerted.
The two agents were taken to a hospital, where they were treated as if they had been exposed to anthrax, Klaus said. But the results of the chemical analysis were returned quickly and they did not have to start antibiotics.
Rene Mundwiler, tournament vice president, said authorities were trying to find who planted the letter.
A "bio alert" was given at 10:12 a.m., a fire department spokesman said. The building was reopened shortly after 11:30 a.m.
Firefighters deployed a fleet of vehicles designed to treat chemical spills. The building was not evacuated but fans were prevented from using the main entrance, police spokeswoman Barbara Umiker said.
There was no immediate information on the whereabouts of the players at the time. Among those to play Tuesday were Tim Henman, Carlos Moya, Alex Corretja and Arnaud Clement.
The scare came as the bioterrorist toll mounted in the United States. The death of two postal workers in Washington of "almost certain" anthrax led health officials to begin testing mail workers from 36 post offices in the nation's capital Tuesday and put thousands on antibiotics as a precaution.
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