U.S. President Barack Obama said Friday he is sending 100 combat troops to central Africa to help and advise forces battling the Ugandan Lord's Resistance Army rebels accused of gross human rights abuses.

"These forces will act as advisers to partner forces that have the goal of removing from the battlefield Joseph Kony and other senior leadership of the LRA," Obama said, but warned they would not lead the fighting themselves.

British Defense Secretary Liam Fox resigned Friday amid a spiraling scandal over his links to the best man at his wedding, becoming the first Conservative minister to quit the coalition government.

Fox, 50, who played a key role in Britain's military campaigns in Libya and Afghanistan, stepped down after it emerged that his friend Adam Werritty posed as a government adviser and took a string of foreign jaunts with the minister.

Police have raided and destroyed a huge drug processing lab in eastern Colombia, seizing six tons of cocaine with a street value of $180 million, the force's chief narcotics officer said Friday.

"Police located and destroyed a cocaine production megalaboratory that belonged to the ERPAC drug gang," General Luis Alberto Perez said.

Turkish police have detained six suspects in connection with last month's bomb attack that rocked the center of the capital Ankara, killing five people, local security sources said Friday.

Police from southeastern Diyarbakir province launched simultaneous raids on two houses as part of an investigation by an Ankara prosecutor's office, the sources said.

A U.S. drone strike killed four militants in northwestern Pakistan on Friday, the third such attack in 48 hours against Taliban hotbeds in Waziristan near the Afghan border, officials said.

The drone fired two missiles into a vehicle as it drove through Darpa Khel village about four kilometers (two miles) west of Miranshah, the main town in the district of North Waziristan, the Pakistani security officials told AFP.

European Union foreign policy Chief Catherine Ashton urged Malawi on Friday to arrest visiting Sudanese President Omar al-Bashir, who is wanted for war crimes.

Ashton "is concerned by the announced visit of President of Sudan Omar al-Bashir to Malawi," her press office said, noting that Malawi is a state party to the Rome Statute that established the International Criminal Court.

A British minister was left red-faced Friday after he was snapped disposing of official documents in a central London park bin.

Oliver Letwin, the Minister for Government Policy, dumped ripped up papers relating to Britain's controversial methods of interrogating terror suspects in St James Park, a short distance from Prime Minister David Cameron's Downing Street base, the Daily Mirror reported.

Papua New Guinean officials were Friday trying to piece together how a passenger plane crashed in dense forest, killing 28 people -- but leaving four survivors -- in the nation's worst air disaster.

The survivors were the Australian and New Zealand pilots, a flight attendant, and a passenger believed to be a Chinese national, who reportedly escaped the fiery wreckage through a crack in the fuselage.

A fighter jet plunged to the ground and exploded as it took part in an air display at a show in northern China Friday, organizers and state media said.

China's state-run television CCTV showed images of the Chinese-made plane falling from the sky and bursting into flames when it hit the ground at the show in Shaanxi province.

The United States said Thursday the most senior leader of the extremist Haqqani group yet "taken off the battlefield" had been killed in a lawless tribal area of Pakistan.

"It's been confirmed that Janbaz Zadran, aka Jamil, was killed earlier today in North Waziristan, Pakistan," said a senior US official, revealing the death of the latest target of the secret U.S. anti-terror war.