A Bronx woman who the police say posed as a relative of a boy killed in the mass shooting at Sandy Hook Elementary School in order to solicit donations was arrested on Thursday and charged with lying to federal agents.

The woman, Nouel Alba, 37, claimed to be an aunt of a 6-year-old victim and used her Facebook account, telephone calls and text messages to solicit money for a “funeral fund,” according to a criminal complaint filed in Federal District Court in Connecticut.

When contacted by federal agents investigating fraud schemes related to the shootings in Newtown, Conn., law enforcement officials said Ms. Alba denied that she had posted any messages on Facebook soliciting donations.

“It is unconscionable to think that the families of the victims in Newtown, and a sympathetic community looking to provide them some sort of financial support and comfort, have become the targets of criminals,” said Kimberly K. Mertz, the special agent in charge of the New Haven division of the Federal Bureau of Investigation. “Today’s arrest is a stern message that the F.B.I. will investigate and bring to justice those who perpetrate Internet fund-raising scams, especially those scams that exploit the most vulnerable in their time of shared sorrow.”