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(CNN) - A grenade attack in the eastern Belgian city of Liege left at least two people dead and 64 wounded Tuesday, a spokeswoman for the governor of Liege province said.
Police are searching for at least one suspect, spokeswoman Katrin Delcourt said.
One of the dead is thought to have been involved in the attack.
A source close to the government, who asked not to be named because he was not authorized to speak to the media, told CNN that a man had thrown explosives in a city center square, Place Saint Lambert.
"We are not sure how many injured and dead there are," he said. "We believe the man died in the explosion. We are also investigating the possibility of a second attacker.
"There has been a meeting of the Internal Affairs department to try to gather as much information as possible."
Liege resident Kevin Hauzeur told CNN he ducked for cover as he heard "shots" and an "explosion."
He said he had seen what appeared to be the body of an attacker before police cleared everyone from the area.
Charles Boisoin, a Liege resident whose apartment overlooks the city center, told CNN he and his neighbors have been told they are not allowed to leave their homes.
He said the city center is virtually deserted and all he can hear and see is helicopters flying overhead.
Photos purportedly from the scene, posted on Twitter by Gaspard Grosjean, showed blood on the sidewalk, as well as police officers and vehicles gathered near the scene.
The Liege fire department said it was responding to an emergency but declined to give details.
No one has yet claimed responsibility for the attack.
Police are searching for at least one suspect, spokeswoman Katrin Delcourt said.
One of the dead is thought to have been involved in the attack.
A source close to the government, who asked not to be named because he was not authorized to speak to the media, told CNN that a man had thrown explosives in a city center square, Place Saint Lambert.
"We are not sure how many injured and dead there are," he said. "We believe the man died in the explosion. We are also investigating the possibility of a second attacker.
"There has been a meeting of the Internal Affairs department to try to gather as much information as possible."
Liege resident Kevin Hauzeur told CNN he ducked for cover as he heard "shots" and an "explosion."
He said he had seen what appeared to be the body of an attacker before police cleared everyone from the area.
Charles Boisoin, a Liege resident whose apartment overlooks the city center, told CNN he and his neighbors have been told they are not allowed to leave their homes.
He said the city center is virtually deserted and all he can hear and see is helicopters flying overhead.
Photos purportedly from the scene, posted on Twitter by Gaspard Grosjean, showed blood on the sidewalk, as well as police officers and vehicles gathered near the scene.
The Liege fire department said it was responding to an emergency but declined to give details.
No one has yet claimed responsibility for the attack.
