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Prince George joined his parents at Taronga Zoo for the opening of the bilby enclosure which is named in his honour.
In their final official engagement in Sydney for this Royal Tour, William and Kate left Admiralty House with their son
The Duke joked in a speech given when the Cambridges first arrived in Australia last week: "I suspect George's first word might be 'bilby' - only because koala is harder to say. We really look forward to our time here together as a family."
South Korean prosecutors investigating a ferry disaster said on Sunday they would seek to extend the detention of the ship's captain and two other crew by 10 days as they tried to determine the cause of an accident that may claim more than 300 lives.
"We are trying to find out if there is additional negligence," Prosecutor Yang Joong-jin told a news conference in Mokpo, one of the centres for the investigation.
Yang said that prosecutors had also summoned 10 other people to give evidence, including other crew from the Sewol and officials from the ferry's owner, Chonghaejin Marine Co Ltd.
After more than three days of frustration and failure, divers have finally found a way into a submerged ferry off South Korea's southern shore, discovering more than a dozen bodies inside the ship and pushing the confirmed death toll to 50.
More than 250 people are still missing, most of them high school students on a holiday trip, and anguished families are furious with the pace of rescue efforts.
Russian state television reported that five people were killed when gunmen attacked a checkpoint manned by pro-Russian separatists near the eastern Ukrainian city of Slaviansk.
The state-run Rossiya 24 news station, citing its correspondent in Slaviansk, said three of the dead were with the pro-Russian separatists who control Slaviansk, and the other two were from the group that attacked their checkpoint.
Pope Francis on led Easter rites commemorating what Christians believe was Jesus' resurrection from the dead and urged people to rediscover direction in their lives. Celebrations took place across the globe from Canada to Ukraine.
Formal warnings are to be given to MPs about sexual harassment of staff and proposition of researchers, the Sunday Times (£) reported.
According to the newspaper, an anonymous 24-hour helpline for victims will also be set up by Common Speaker John Bercow.
The measures have been drawn up by the House of Commons commission, a committee of MPs chaired by Bercow.
After the next election, all new MPs will be given training in employment law and how to treat staff. They will also be given warnings about sexual harassment.
Ukraine's Prime Minister Arseny Yatseniuk has said he is concerned as to how far Russia's President Putin will go in what he called attempts to restore the Soviet Union.
"President Putin has a dream to restore the Soviet Union. And every day, he goes further and further. And God knows where is the final destination," Yatseniuk told NBC's Meet the Press for an interview that will air on Sunday morning.
He added: "And I believe that you do remember his famous Munich speech saying that the biggest disaster of the former century is the collapse of the Soviet Union. I consider that the biggest disaster of this century would be the restoring of the Soviet Union under the auspices of President Putin."
The Ukrainian prime minister also said that those behind an anti-Semitic leaflet in the eastern city of Donetsk earlier in the week will be held responsible.
Malaysian Defence Minister Hishammuddin Hussein has stressed the importance of the weekend missions to search for the missing Malaysia Airlines plane to reporters in Kuala Lumpur.
"The narrowing of the search for today and tomorrow is at a very critical juncture, so I appeal to everybody around the world to pray and pray hard that we find something to work on over the next couple of days," he said.
But he added that there were no plans to give up once the Bluefin concludes its work. Instead, he said the scope of the search may be broadened or other assets may be used.
"The search will always continue," he said. "It is just a matter of approach. All efforts will be intensified for the next few days with regards to the underwater search."
A robotic submarine looking for the missing Malaysia Airlines plane continued to dive, after completing about half of its search on the bottom of the Indian Ocean with no luck. The Bluefin 21 unmanned sub began its eighth dive off the coast of western Australia.
Its search area forms a 6.2-mile circle around the location of an underwater signal that was believed to have come from the aircraft's black boxes before their batteries died.
The sonar scan of the seabed in that area is expected to be completed in five to seven days, the search centre said.
As news of further deaths emerged in the South Korea ferry operation, one woman had to be taken away by ambulance after collapsing.
More than 250 people are still missing, most of them high school students on a holiday trip.