World News Update, what you need to know

A state trooper and the gunman are reportedly dead after a shooting at a Greyhound bus station in the US state of Virginia.

ELSEWHERE:

MONCTON, New Brunswick - Additional charges have been laid against a man accused of luring thousands of young boys from around the globe, including some from Australia, into taking part in an online child porn ring.

GENEVA - Researchers are now convinced that the Zika virus is linked to the birth defect microcephaly and to Guillain-Barre, a rare neurological disorder that can cause paralysis, the World Health Organisation says.

NEW DELHI - At least 21 people have been killed, 60 injured and many others feared trapped after a highway overpass collapsed in the eastern Indian city of Kolkata.

VATICAN CITY - The Vatican says it is investigating two former officials over claims money meant for a children's hospital was used to refurbish a cardinal's luxury apartment.

PARIS - An eight-year-old boy from the Indian Ocean island nation of Comoros has been in a transit zone in Paris' Charles de Gaulle airport for 10 days after trying to enter France illegally.

THE HAGUE - UN judges have acquitted Serbian nationalist firebrand Vojislav Seselj of war crimes and crimes against humanity, a shock verdict that has delivered a boost to his anti-EU Serbian Radical Party ahead of April elections.