A man has been killed in a machete attack and two suspects shot and wounded by police in Woolwich, south-east London.
The Met Police said a murder inquiry was being led by its Counter Terrorism Command. Prime Minister David Cameron said the UK would "never buckle" in the face of terror attacks.
Footage has emerged showing a man wielding a bloodied meat cleaver and making political statements.
Police confirmed two men had been arrested in connection
Emergency crews' search in the ruins left by the gigantic tornado that killed two dozen people in Oklahoma on Monday is almost over, say officials.
Fire chief Gary Bird said he was "98% sure" there were no more survivors or bodies to recover from the rubble.
The storm, which also killed nine children, has meanwhile been upgraded to the most powerful level of twister.
Packing winds of at least 200mph (320km/h), the tornado razed a swathe of the Oklahoma City suburb of
It turns out it’s not just some patients’ imaginations running away with them when they feel like their doctor is as compassionate as he or she should be. A small recent study found a statistically significant amount of difference between the way doctors interacted with thin patients as opposed to obese patients.
The study, published in the medical journal Obesity by researchers at Johns Hopkins University, recorded discussions between 200 patients with high blood pressure and their
President Barack Obama has said US tax collection agency's targeting of conservative groups for extra scrutiny before an election was "outrageous".
At the White House, Mr Obama said the Internal Revenue Service (IRS) needed to operate with "absolute integrity".
Groups with the words "Tea Party" or "patriot" in their names were singled out, the tax agency has acknowledged.
He also said criticisms of the response
There has been a lot of hype lately about white roofing systems and their ability to reduce global warming. According to studies done at Lawrence Berkeley Laboratories, white (reflective) roofing systems can prevent the “heat island effect” in which darker roofs actually elevate the temperature in larger cities.But many engineers and roof system designers are questioning whether these white roofing systems are actually an energy efficient choice.
White roofs and global warming