There's renewed pressure to beef up security for thousands of relocating Department of Defense workers in northern Virginia.
Alexandria Mayor Bill Euille sent President Barack Obama a letter recently driving home his concerns.
It comes just days after a report on TIME magazine's website said the Mark Center was vulnerable to a truck bombing.
Lawmakers worry the building could be wiped out by a high-profile terrorist attack since the building sits so closely to a major interstate.
Euille said the city's had trouble getting information to prepare an emergency response plan.
“It is necessary for the DOD to be open and honest with the city and its residents so that they can be reassured that there is no lack of security at the WHS,” he wrote.
A spokesman with the Army Corps of Engineers said security levels at the new complex are similar to those at the Pentagon.
More than 6,000 Pentagon workers will eventually move into the complex on Seminary Road at Interstate 395.