Two prominent journalists, one at Fox News and one at The Washington Post, are facing allegations of inappropriate workplace conduct.

NPR reported Wednesday that James Rosen, a former Washington correspondent who left Fox News last month, had done so after the network began scrutinizing sexual misconduct allegations against him. And Joel Achenbach, a Washington Post reporter, received a 90-day suspension on Wednesday for unspecified misconduct involving current and former female colleagues.

Mr. Rosen, who had worked at Fox for 18 years, was known for his reporting on national security; an article he wrote in 2009 on intelligence related to North Korea led the Justice Department under President Barack Obama to investigate him and his sources. According to NPR, which cited eight former colleagues, Mr. Rosen “had an established pattern of flirting aggressively with many peers and had made sexual advances toward three female Fox News journalists, including two reporters and a producer.”

Mr. Rosen did not immediately respond to a Twitter message requesting comment, and a home phone number listed for him was not in service. A spokeswoman for Fox News did not respond to an email.