WASHINGTON — NASA has shut down a large public database and is limiting access to agency facilities by foreign citizens as part of a broader investigation into efforts by China and other countries to get information about important technology.

NASA announced the security procedures this week, after the F.B.I. arrested a Chinese citizen at Dulles International Airport in Virginia who had boarded a plane to Beijing.

The man, Bo Jiang, had been working as a contractor at NASA’s Langley Research Center in southern Virginia. According to an affidavit filed on Monday, Mr. Jiang is being charged with making false statements to federal agents — failing to disclose that he was carrying a laptop, hard drive and SIM card that were discovered after a search of his belongings.

An F.B.I. spokesman declined to comment, citing that the case was continuing. A lawyer for Mr. Jiang in Virginia, Fernando Groene, also declined to comment.