Danny Fenster an American journalist detained almost five months is being prosecuted for an offense allegedly carried out by a news service for which he had stopped working more than half-a-year previously, his lawyer said Friday, AP reported.

Media groups and the U.S. government have called for Fenster’s release. He is among about 100 journalists detained since a Feb. 1 military takeover ousted the elected government of Aung San Suu Kyi. More than half have since been released, but the media remain under tight restrictions.

Fenster had worked until July last year as a reporter and copy editor for the online news site Myanmar Now.