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A white off-duty St. Louis city policeman shot and killed a black teenager who fired on him on Wednesday Wholesale Tom Glavine Jersey , police said, triggering protests just miles from the flashpoint suburb of Ferguson.


Ferguson has been racked by near nightly protests since the fatal shooting in August of black 18-year-old Michael Brown by a white police officer.


In Wednesday's incident another officer, a 32-year-old working for a security company Wholesale Phil Niekro Jersey , fired 17 times at another 18-year-old, who had himself fired at least three shots, St. Louis Metropolitan Police Chief Sam Dotson said.


The dead man was one of three people who fled after being approached and then chased by the officer Wholesale Orlando Cepeda Jersey , a six-year veteran of the department who was wearing his city police uniform, Dotson told a news conference.


A crowd of around 200 gathered at the scene in south St. Louis. Many of the protesters marched to a major thoroughfare, partially blocking traffic and chanting "Whose streets? Our streets?" as a police helicopter hovered overhead.


At one point Wholesale Deion Sanders Jersey , roughly a dozen people punched and kicked two occupied police vehicles, one that was marked and another that was unmarked. Demonstrators then broke the back window of a marked police vehicle.


As of early Thursday morning, none of the protesters had been arrested Wholesale David Justice Jersey , Dotson said.


'MICHAEL BROWN ALL OVER AGAIN'


Teyonna Myers, 23, told the St. Louis Post-Dispatch newspaper that she was the cousin of the suspect and that he was unarmed when he was killed. Police have not named the suspect.


"He had a sandwich in his hand Wholesale Chipper Jones Jersey , and they thought it was a gun. It's like Michael Brown all over again," she told the paper.


The officer was not hurt and a gun was recovered from the scene, police said.


The officer has been placed on administrative leave and an investigation was under way Wholesale Bob Uecker Jersey , police said.


The shooting occurred in the neighborhood of Shaw, a historic district with low levels of crime. As of September, there had been no homicides this year and five cases of aggravated assault Wholesale Bobby Cox Jersey , according to police crime statistics.




LOS ANGELES， June 15 (Xinhua) -- Four months after the historic first-ever detection of gravitational waves， scientists said Wednesday they have directly detected another gravitational wave washing over the Earth.


The gravitational waves， ripples in the fabric of spacetime， were observed for a second time on Dec. 26， 2015， in the United States.


"Despite these being so tiny， these LIGO (Laser Interferometer Gravitational-Wave Observatory ) instruments on Earth detected very clearly these gravitational waves，" Gabriela Gonzalez， the LIGO scientific collaboration (LSC) spokesperson， told a press conference held by the American Astronomical Society in San Diego， California.


"We are very proud of this being the beginning of gravitational wave astronomy，" Gonzalez said. The discovery has been accepted for publication in the journal Physical Review Letters.


Like the first detection， scientists said that the incredibly faint ripple that eventually reached the Earth was the result of the spinning dance of a binary black hole pair on the brink of merging.


This time， the black holes weighed in at 14 and 8 solar masses and merged to form a single， spinning 21-solar-mass black hole， some 1.4 billion light years away. The collision and subsequent merger released approximately one solar mass of energy， which was radiated away as gravitational waves.


The first detection of gravitational waves， announced on Feb. 11， 2016， was a milestone in physics and astronomy. It confirmed a major prediction of Albert Einstein's 1915 general theory of relativity and marked the beginning of the new field of gravitational wave astronomy.


LIGO's historic first detection on Sept. 14， 2015， resulted from a merger of two black holes that were much larger， carrying 36 and 29 solar masses respectively.


With these two confirmed detections， along with a third likely detection made in October 2015， which is also believed to be caused by a pair of merging black holes， scientists can now start to estimate the rate of black hole coalescences in the Universe based not on theory， but on real observations. ( According to LIGO， its next observing interval will start in the Fall of 2016. With improved sensitivity， scientists expect to see more black hole coalescences， and possibly detect gravitational waves from other sources， like binary neutron-star mergers.


"Gravitational waves astronomy is real and we are here，" David Reitze， executive director of the LIGO Laboratory at Caltech， said.

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