US Secret Service director Julia Pierson has said the recent White House security breach by a man carrying a knife was unacceptable and promised "it will never happen again."
"It is clear that our security plan was not executed properly," Pierson said in prepared testimony to a committee investigating the breach.
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The White House has said it is watching the situation in Hong Kong closely, and urged authorities to show restraint and protesters to be peaceful.
"The United States supports universal suffrage in Hong Kong in accordance with the basic law and we support the aspirations of the Hong Kong people," White House spokesman Josh Earnest said.
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The parents of the unarmed black teenager gunned down by police in Ferguson in the US have rejected an apology by the city's top cop.
Michael Brown's mother, Lesley McSpadden, said Darren Wilson, the white officer who fired the gun, should instead be arrested.
The 18-year-old's death sparked days of widespread rioting.
"An apology would be when Darren Wilson has handcuffs, processed and charged with murder," Michael's father Michael Brown Sr said.
A man who beheaded a female colleague and stabbed another after being sacked from a food processing plant in Oklahoma is set to be charged with first degree murder.
Police said Alton Nolen had now regained consciousness after being shot by a boss at the firm.
Nolen, who is said to be a Muslim convert and was described by his local mosque as "a little weird", will also be charged with assault and battery with a deadly weapon. If convicted he faces the death penalty.
The 30-year-old was sacked for "numerous reasons" involving "personnel issues" moments before the attack which took place in the company's HR office.
Once there, he attacked Colleen Hufford, 54, with a knife, eventually severing her head. He then repeatedly stabbed 43-year-old Traci Johnson.
Ms Johnson was treated for her injuries and has since been released from hospital.
A woman beheaded at work by a 'Muslim convert' who had just been sacked has been named as 54-year-old Colleen Hufford.
Her alleged attacker Alton Nolen is also said to have stabbed another woman, 43-year-old Traci Johnson, several times before a security guard shot him.
Police in the Oklahoma City suburb of Moore are waiting for the 30-year-old to regain consciousness so they can arrest him over Thursday's attack.
They have asked the FBI to help investigate after co-workers at Vaughan Foods told authorities that Nolen had been trying to convert several employees to Islam.
A man suspected of beheading a co-worker after allegedly being sacked from an Oklahoma food processing plant was on probation for assaulting a police officer.
Prison records show Alton Nolen has also spent almost two years in jail for cocaine possession and intent to distribute in 2011.
The 30-year-old is accused of beheading one woman and stabbing another at Vaughan Foods in Moore, an Oklahoma City suburb. The surviving woman remains in hospital.
Moore Police Sergeant Jeremy Lewis said Nolen was shot and wounded by a company official, who also is a reserve sheriff's deputy.
Nolen has not been formally charged and remains in hospital.