Story highlights Maria Golovnina died Monday after falling unconscious, Reuters says

Medical teams were unable to save the bureau chief

(CNN) The bureau chief for Reuters in Afghanistan and Pakistan, Maria Golovnina, died Monday after falling unconscious, her employer said.

Golovnina, 34, passed out at her office in the Pakistani capital, according to a statement from Reuters. Medical responders were unable to save her.

The cause of death is being investigated, police official Mohammad Yaqoob said.

"Maria was a superb journalist with a long and varied career at Reuters," the news agency said.

She joined the company in 2001 as a foreign correspondent in a number of places, including London, Singapore, Moscow, Afghanistan and Iraq. She had been bureau chief for Afghanistan and Pakistan since 2013.