China on Thursday blasted the United States over human rights, accusing Washington of mudslinging, hypocrisy and double standards after John Kerry and the U.S. ambassador to China voiced concerns over the issue.

At a regular briefing, Chinese foreign ministry spokesman Hong Lei said Washington was guilty of "racial prejudice and torture and other serious violations of human rights", in an apparent reference to a scathing Senate report detailing torture of "war on terror" detainees.

British authorities arrested 76 people at a mass "die-in" in London held in solidarity with demonstrations sweeping the United States over recent controversial killings of black men by police.

Hundreds of demonstrators blocked the Westfield shopping mall in west London by lying down on the floor, many holding placards echoing the "Black lives matter" and "Hands up" slogans branded on signs at the U.S. protests.

A Pakistani detained at Afghanistan's infamous Bagram jail, where he was beaten and threatened with dogs, told AFP that a damning US report on the brutal treatment of terror detainees will do nothing to return the five years he lost to the ordeal.

The U.S. Senate report released Wednesday revealed grim details about how prisoners were treated at so-called "black sites", facing torture ranging from rectal feeding to being suspended from the ceiling by their wrists.

Detailed revelations of the torture used by George W. Bush-era operatives against al-Qaida suspects are only the latest morale-sapping scandal to envelop the Central Intelligence Agency.

But the searing U.S. Senate Intelligence Committee report on CIA enhanced interrogation techniques is not likely to hamstring the effectiveness of the nation's premier spy shop or erode its power in the post-9/11 era, lawmakers, experts and former intelligence agents predicted Wednesday.

Afghanistan's new President Ashraf Ghani on Wednesday condemned CIA torture detailed in a U.S. Senate report, saying the United States' actions violated "all accepted principles of human rights" and were part of vicious cycle of violence.

"The Afghan government condemns these inhumane actions in the strongest terms," he said at a specially-convened press conference at the presidential palace in Kabul.

Germany said Wednesday the CIA torture detailed in a U.S. Senate report was "a gross violation of our liberal, democratic values" that must never happen again and "a serious mistake."

Foreign Minister Frank-Walter Steinmeier praised the administration of U.S. President Barack Obama for declassifying the information, calling it a transparent move that marked a clear break with his predecessor George W. Bush.

Hundreds of relatives of people who disappeared during a violent crackdown on the opposition ahead of this year's elections in Bangladesh protested on Wednesday to demand justice.

More than 200 people were killed in street clashes between the security forces and opposition supporters before and during the January 5 polls.

The last Soviet leader Mikhail Gorbachev on Tuesday urged the United States and the European Union to "defrost" relations with Moscow despite tensions over Ukraine.

The 83-year-old said in an article published in state daily Rossiiskaya Gazeta that the Ukraine crisis had led the West not only to impose sanctions on Russia but also to wind up cooperation on global issues from counter-terrorism to climate change and disease epidemics.

Pakistan's military said on Wednesday it had killed 11 militants in air strikes in a troubled tribal district near the Afghan border.

The raids took place Tuesday evening in Tirah area of Khyber district where the Taliban and another banned militant group the Lashkar-e-Islam have taken refuge, the military said in a statement.

A U.S. man has been arrested in Israel on suspicion of preparing attacks on Muslims, police said Tuesday.

"Shin Bet (internal security) and police arrested an American citizen on November 19 who was illegally in Israel, for possession of weapons and planning terrorist attacks," a statement said.