WASHINGTON — The person suspected of recently leaking classified US government documents has been identified as Jack Teixeira, a 21-year-old member of the Massachusetts Air National Guard, two law enforcement officials said Thursday.

The officials, who spoke on condition of anonymity to discuss an ongoing investigation, said they have been following him for some time and an arrest is imminent.

Classified Defense Department documents were found online last month (it’s unclear how long they were on the internet and the total number that were released) and revealed details of US spying on Russia’s war efforts in Ukraine. , secret evaluations. of Ukraine’s combat power, as well as intelligence gathering on US allies, including South Korea and Israel, NBC News previously reported.

President Joe Biden suggested Thursday morning that officials appeared to be nearing a breakthrough in their investigation into who leaked the documents online.

“There is a full investigation going on, as you know, with the Intelligence Committee and the Department of Justice, and they are getting close,” Biden told reporters in Ireland.