Maryland arson police seek driver of blue van
A dozen homes were destroyed
 |  Firefighters douse the smoldering wreckage of homes under construction. |
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 Authorities believe fires in Maryland subdivision were set.
 Deputy fire marshal discusses outbreak of subdivision fires.
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INDIAN HEAD, Maryland (CNN) -- Authorities investigating suspicious fires that destroyed 12 homes and damaged 14 others in a Charles County subdivision are looking for the driver of a blue van that was seen in the area when the fires broke out, a federal law enforcement source close to the investigation told CNN on Wednesday.
The source said investigators are not calling the driver of the van a suspect, but said they want to talk to the person.
The van was noticed in the area by firefighters who were responding to calls about the fires, the source said.
Meanwhile, more than 100 investigators have been assigned to search for clues to who set the fires, an official said Tuesday.
Arson caused at least seven of the fires, which were reported at 4:30 a.m. Monday and caused about $10 million in damage, Deputy State Fire Marshal W. Faron Taylor told reporters.
"We have not been able to rule out anything at this point," he said.
"What we're doing is working to identify what happened and how it happened and that will help lead us to who is responsible."
The residential development -- two adjacent subdivisions about 30 miles southeast of Washington in Charles County -- had been opposed by activists who claimed the construction would damage a wetlands area.
It had been the subject of a lawsuit between environmentalists and the Army Corps of Engineers.
Although no motive has been established, arson investigators led by the Maryland state fire marshal have called for members of a joint terrorism task force to explore the possibility of eco-terrorism.
But Taylor said investigators were not focusing on any one possible motive. "There is a whole host of different motives that are available," he said.
In addition to the state fire marshal, the investigation includes personnel from the FBI; the bureau of Alcohol, Tobacco, Firearms and Explosives; and several local law enforcement agencies, Taylor said.
Taylor would not discuss how the fires started, although law enforcement sources told CNN Monday that jugs containing an accelerant were discovered at the scene. Some of the devices did not ignite, leaving evidence that was being processed.
Investigators are trying to determine whether anyone from a security company hired by the builder to oversee the site was there when the fire began.
The builder, Patriot Homes, had posted a sign saying the area was under 24-hour video surveillance. Taylor would not say whether that was indeed the case.
Only one of the homes was occupied. Its occupants were evacuated and authorities said they did not know when they would be allowed to return.
Officials said a previous statement that 41 homes were damaged or destroyed was wrong.
CNN correspondent Brian Todd contributed to this report.
