A man who took three people hostage in the headquarters of the Discovery Channel near Washington has been shot dead by US police.
Officers who had been watching the hostage drama on a building security camera crept in while police negotiated with the emotional gunman and shot him when he pointed his pistol at one of the three men he held hostage.
"A hostage moved, he pulled his gun, and a shot was taken," Montgomery County police chief Tom Manger told reporters. He said the suspect was killed and the hostages were safe.
The man, named by a US law enforcement official as James Lee, had been arrested before for protesting against Discovery Channel over environmental issues.
"He had a history ... of conflict with Discovery," Mr Manger said.
The incident caused chaos in Silver Spring, Maryland, a shopping and office district and commuter hub on the edge of the US capital.
Police sealed off the area around the building and SWAT teams deployed shortly after the suspect entered the building carrying a handgun. Mr Manger said county and state police, FBI and Homeland Security agents joined the operation.
The building, where nearly 1,900 employees work, was evacuated and children were rushed from a day-care centre.
Police said they were still trying to determine whether two boxes and two backpacks that the hostage-taker had were explosive devices. Bomb-sniffing dogs checked the area before workers were allowed to leave neighbouring buildings.
According to a newspaper report in the Montgomery County Gazette last year, a James Lee of San Diego was arrested in February 2008 after throwing money into the air in a protest outside the Discovery building.
A website registered under the name of James Lee contained demands that Discovery air programming urging people to stop having babies, which he says is leading to the overpopulation of the planet.
"Civilisation must be exposed for the filth it is," reads the site, savetheplanetprotest.com. "Saving the Planet means saving what's left of the non-human Wildlife by decreasing the Human population. That means stopping the human race from breeding any more disgusting human babies!" it says.
Police kept the gunman talking by telephone almost the whole time. "He went from being agitated to being calm," said Manger. The hostages, two Discovery employees and a security guard, just happened to have been in the lobby and were kept lying on the floor by the gunman, he said.
Discovery Communications says it reaches 1.5 billion subscribers in more than 180 countries with the Discovery Channel, TLC, Animal Planet, Science Channel and Planet Green networks.
Reuters