World News Update, what you need to know

A police officer has been shot and wounded in the US Capitol complex in Washington DC where congress sits and the gunman captured.

ELSEWHERE:

BELFAST - Police have been attacked with petrol bombs in sporadic trouble in a republican area of Northern Ireland.

BRUSSELS - A man widely reported to be the third individual in CCTV footage of two suspected suicide bombers at Brussels airport has been released due to lack of evidence.

BEIRUT - Fighting between Islamic State and the al Qaeda-linked Nusra Front has spread from Syria into Lebanon's northern Bekaa Valley region, killing combatants on both sides, a security source and the state news agency say.

WASHINGTON - Rain clouds auspiciously parted, A-list guests including the Easter Bunny and Beyonce were on hand and first dogs Sunny and Bo obliged for selfies as US President Barack Obama celebrated his final Easter egg roll at the White House.

ANCHORAGE - A remote and active volcano on Alaska's Aleutian Islands has erupted, sending ash 6.1 kilometres into the air.

WARSAW - Polish police have detained 21 people in connection with a false bomb threat that caused 800 people to be evacuated and four flights to be diverted from an airport near the capital.