Archaeologists have uncovered Nazi gas chambers at the Sobibor extermination camp in Poland, which the Germans tried to hide after a prisoner revolt in 1943.
During the war, the camp was dismantled, covered with earth and planted over with pine trees to conceal its location.
More than 250,000 Jews were murdered at the camp during the year and half it operated.
The Germans closed the camp after a prisoner revolt in October 1943, when several hundred inmates tried to escape, killing several German officers and guards.
Many of the prisoners fled the camp, but nearly all were killed by guards or died in water ditches and mine fields surrounding the camp.
The Government will provide £12m over the next three years to deal with illegal immigrants trying to get to the UK from Calais.
Home Secretary Theresa May and her French counterpart Bernard Cazeneuve reached a deal which will also see increased co-operation between British and French law enforcement agencies.
They also agreed to do more to tackle organised gangs involved in people trafficking and smuggling.
Security and Immigration Minister James Brokenshire said the two countries would also "continue to push for action at European and international level to address the wider problem of illegal migration, of which Calais is just one very visible sign".
The British couple missing in Mexico have been named as Paul Whitehouse and Simone Wood.
The BBC reports friends of the couple saying they were on a yacht which capsized off the coastal town of La Paz on the Baja peninsula.
Mr Whitehouse, from Wolverhampton, is reported to have been working as a scuba diving instructor in the resort for about a year.
The Foreign Office has said it is providing consular assistance to the families "at this difficult time".
About 45,000 Syrian Kurds have crossed the border into Turkey after an advance by Islamic State militants, the Turkish Deputy Prime Minister has said.
"Around 45,000 Syrian Kurds have crossed the border as of now from eight entrance points along a 30 km distance from Akcakale to Mursitpinar since we opened the border yesterday," Numan Kurtulmus told CNN Turk television.
Staff from the NHS are being encouraged to volunteer to help with the deadly Ebola virus outbreak in West Africa.
The Department of Health's chief medical officer Professor Dame Sally Davies has written to health service staff to point them towards the UK International Emergency Medical Register.
Doctors, nurses and paramedics are among the medical staff who will be needed to help contribute towards efforts to tackle the crisis, she said.
British Muslim scholars have called for the release of a British aid worker being held by Islamic State, describing the threats against him as "totally prohibited" under Islamic law.
Alan Henning, 47 , the former taxi driver from Manchester, was threatened by IS militants at the end of a video showing the murder of David Haines.
In a YouTube video, Shaykh Haitham Al Haddad appeals for the immediate and "unconditional" release of Henning, telling militants: "executing this man is totally harem (prohibited) according to Sharia."
"Whatever your grievances with American or British foreign policy, executing this man is not the answer," Al Haddad added.
Imam Shakeel Begg, of Lewisham Islamic Centre, says there is "no justification in our religion that allows you to continue to hold him let alone harm him".
The video comes after more than 100 Muslim leaders from across the UK signed an open letter calling for Mr Henning's release.
An intruder managed to make it through doors into the White House before he was caught, officials say.
Omar J Gonzalez, 42, jumped over a fence and ran towards the residence before entering the North Portico doors, sparking a partial evacuation of staff and reporters.
The incident occurred just minutes after President Obama and his daughters had left in a helicopter.
After Gonzalez was detained and a search of the area complete, workers were allowed to re-enter the White House.
A Secret Service spokesperson told NBC News it "will review the response to ensure that proper protocol is followed."
Forty-nine Turkish hostages captured by Islamic State militants in the Iraqi city of Mosul in June have all been released, Turkish Prime Minister Ahmet Davutoglu said.
Ukraine's government and pro-Russian rebels have agreed to strengthen a ceasefire agreement in eastern Ukraine.
The deal includes creating a buffer zone to separate government troops and pro-Russian militants, withdrawing heavy weapons and foreign fighters and bans flights by military aircraft over eastern Ukraine.
Agreement was reached following talks in the Belarusian capital Minsk between representatives of Ukraine, Russia, separatists and the Organisation for Security and Co-operation in Europe (OSCE).
It is hoped the agreement will add substance to the ceasefire deal that was signed on September 5.
More than 3,000 people have been killed since fighting began in the region five months ago.
A search is under way for two Britons who have been reported missing at sea after a hurricane in Mexico.
The British nationals were reported missing yesterday aboard a yacht in the Sea of Cortez.
Marines and sailors are said to be involved in a search operation for the Britons.
A Foreign Office spokeswoman told ITV News: "We are in touch with the local authorities and are providing consular assistance to the families at this difficult time."
Hurricane Odile has left Mexico's Baja California Peninsula devastated since last weekend, affecting water and power supplies, and sparking widespread looting.