Female journalists are facing a "relentless" barrage of attacks and harassment, with nearly a third considering leaving the profession as a result, media support organizations have warned.

More than half of women in media have suffered work-related abuse, threats or physical attacks in the past year, found a survey by the International Women's Media Foundation (IWMF) and TrollBusters, which supports reporters being harassed.

"Female journalists are dealing with harassment on a daily basis," said Elisa Lees Munoz, executive director of the U.S.-based IWMF, which promotes women journalists.