The U.S. teen who sparked an Internet sensation by building a small drone capable of firing a handgun, has been arrested and released on a $20,000 bond, police said Thursday.

Austin Haughwout, an 18-year-old mechanical engineering student from Clinton, Connecticut, was charged with assault and interfering with a police officer, officials said.

Dozens of countries have agreed to abolish duties on more than 200 technology products — from advanced computer chips to GPS devices, printer cartridges and video-game consoles.

The agreement announced Friday marks the World Trade Organization's first tariff-killing deal in 18 years.

Samsung remained the top global smartphone vendor in the second quarter despite slowing sales, while Apple and Chinese manufacturers boosted market share, a survey showed Thursday.

The quarterly survey by research firm IDC showed the global market for smartphones grew 11.6 percent from a year ago to 337.2 million units, the second highest quarterly total on record.

China has started assembling the world's largest radio telescope, which will have a dish the size of 30 football pitches when completed, state media reported as Beijing steps up its ambitions in outer space.

The five-hundred-meter Aperture Spherical Radio Telescope (FAST) nestles in a bowl-shaped valley between hills in the southwestern province of Guizhou, images posted online show.

China has 668 million Internet users, accounting for 48.8 percent of the country's total population, as e-commerce boomed in the world's second-largest economy, authorities said.

A total of 18.94 million new users -- more than the population of Chile -- were added in the first six months of this year, the semi-official China Internet Network Information Center (CNNIC) said in its biannual report.

Microsoft announced Wednesday it was joining an effort to curb so-called "revenge porn," by helping victims remove links to sexually explicit images of them posted without their consent.

"When someone shares intimate images of another person online without that person's consent, the effects can be truly devastating," said Microsoft chief online safety office Jacqueline Beauchere in a blog post.

Twitter users in Turkey could again access their accounts on Wednesday following an hours-long blockage after a court decision banning the publication of images of a deadly suicide bombing in all print, visual and online media, a Turkish official said.

"We notified Twitter about 107 URL addresses that must be removed in compliance with the court order," the official told AFP, saying that Twitter blocked those addresses after talks with the government.

A team of American humanoid robots defeated foes from Iran on Wednesday in the final of an annual football tournament for intelligent sporting machines held in China.

In a tightly fought final, a team designed by the University of Pennsylvania and named THORwIn scored five goals compared to four from Iranian team Baset Adult-Size, organizers said.

For all those who hailed the iPhone as the "Jesus Phone" in 2007, the Apple Watch's arrival has hardly been the second coming.

Sure, it can do many useful, even delightful things, such as showing us incoming texts and email, tracking our heart rate during exercise or letting us send digital doodles to friends. But is that enough to spend $350 or more, especially when it requires wearing a watch again? After all, smartphones have negated the need for watches to tell time.

The Federal Aviation Administration said Tuesday it was investigating an online video that shows an alleged home-made "drone" firing a handgun in the Connecticut countryside.

The 14-second video called "Flying Gun" shows a homemade multi-rotor hovering off the ground, buzzing furiously and firing a semiautomatic handgun four times at an unseen target.