As concerns rise about a security menace posed by rogue drone flights Hydro Flask Lahve Ombre 40 OZ Wide Mouth Oranžová Růžové , U.S. government agencies are working with state and local police forces to develop high-tech systems to protect vulnerable sites, according to sources familiar with the matter.


Although the research aimed at tracking and disabling drones is at an early stage, there has been at least one field test.


Last New Year's Eve, New York police used a microwave-based system to try to track a commercially available drone at a packed Times Square and send it back to its operator, according to one source involved in the test.


The previously unreported test, which ran into difficulty because of interference from nearby media broadcasts, was part of the nationwide development effort that includes the Department of Homeland Security, the Federal Aviation Administration and the Defense Department, the source said.


The sources were not authorized to speak about the effort and declined to be identified.


Asked about the development of counter-drone-technology, the Department of Homeland Security said it "works side-by-side with our interagency partners" to develop solutions to address the unlawful use of drones. Officials with the Defense Department, FAA and New York Police Department declined to comment.


But the sources acknowledged that efforts to combat rogue drones have gained new urgency due to the sharp rise in drone use and a series of alarming incidents.


The number of unauthorized drone flights has surged over the past year, raising concerns that one could hit a commercial aircraft during landing or take-off, or be used as a weapon in a deliberate attack, the sources said.


Drones have flown perilously close to airliners, interfered with firefighting operations, been used to transport illegal drugs into the United States from Mexico, and sparked a security scare at the White House, among other incidents.


LIMITED POWERS


But U.S. authorities have limited tools for identifying drone operators, many of them hobbyists, who violate federal rules that drones fly no higher than 400 feet (120 meters) and no closer than 5 miles (8 km) to airports. One reason for the enforcement gap is that Congress in 2012 barred the FAA from regulating recreational drones.


A system capable of disabling a drone and identifying its operator would give law enforcement officials practical powers to block the flights.


At crowded venues such as Times Square or the Super Bowl, police want to be able to take control of a drone, steer it safely away from the public and guide it back to the operators, who can then be identified, the sources said.


A Reuters analysis of FAA data shows that authorities identified operators in only one in 10 unauthorized drone sightings reported in 2014, while only 2 percent of the cases led to enforcement actions.


"We can’t shoot it out of the sky. We have to come up with something that's kind of basic technology so that if something happens, the drone or device will just go right back to the operators. It won't crash," one of the sources said.


To do that, experts say that a drone needs to be tracked and identified with a receiver and then targeted with an electromagnetic signal strong enough to overwhelm its radio controls.


“You need enough power to override the transmitter. If I just jam it so it can’t receive signals, it’s probably going to crash. But if I know the transmission codes the drone is using, I can control that object,” said retired U.S. Marine Lieutenant Colonel Muddy Watters, an electronic warfare expert.


Laws governing the use of drones have lagged their dramatic rise in areas spanning agriculture, filming and recreational use. Recreational drone operators are not required to register their machines, obtain training or put identifying features on the aircraft, making it extremely difficult for police to track down rogue operators.


FIRE-FIGHTING DISRUPTION, SECURITY SCARES


U.S. pilots have reported more than 650 drone sightings this year, as of Aug. 9, well over double the 238 total for all of 2014, the FAA said last week.


More than 1 million drones of all kinds are expected to be sold in the United States this year, compared to 430,000 in 2014 and 120,000 in 2013, according to the Consumer Electronics Association.


In California, errant drones forced firefighters to suspend air drops of water and fire retardant on wild fires this summer.