Serbia's war crimes prosecutor says his office has faced an orchestrated campaign by war criminals and nationalists — including accusations of spying for the U.S. leveled also by some officials — after it recently moved to open sensitive cases from the Balkan country's wartime past.

Vladimir Vukcevic told The Associated Press in an interview on Thursday that he, his team and their families have received death threats and faced attacks in the nationalist media that have "coincided with our work in about four cases."

In late December, two lawmakers from the ruling coalition filed espionage charges against the prosecutors for allegedly revealing sensitive information about their cases to U.S. embassy officials.

Vukcevic says "we have stirred up a hornet's nest."