Washington ( CNN ) -- A U.S. Navy drone crashed Monday in a marsh near Salisbury , Maryland . The RQ-4A Global Hawk drone crashed during a routine training flight from Naval Air Station Patuxent River , according to Jamie Cosgrove , a spokeswoman for the Unmanned Aviation and Strike Weapons Program at the base . There were no injuries to civilians and no property damage , said the Navy , which said it is investigating the cause . Video from CNN affiliate WBOC showed smoke rising from brush fires in the unpopulated area . The drone crashed into a tributary of the Nanticoke River , a U.S. Coast Guard official said . The crash site has been blocked to recreational boat traffic while the agency investigates , the Coast Guard official said . As soon as Navy personnel lost contact with the unmanned vehicle , a piloted aircraft was dispatched to Maryland 's Eastern Shore , where it came upon the wreckage and determined that it was unlikely anyone on the ground had been hurt , Navy officials told CNN . The crash occurred at about 12:11 p.m. , near Bloodworth Island in Dorchester County , the Navy said . The aircraft is one of five aircraft acquired from the Air Force Global Hawk program . The BAMS-D program has been developing tactics and doctrine for the employment of high-altitude unmanned patrol aircraft since November 2006 . The drone can fly for 30 hours without refueling at altitudes as high as 11 miles . It is typically used for reconnaissance . Of the five drones based at southern Maryland 's Naval Air Station Patuxent River , four are in routine training and one is deployed with the U.S. Navy Fifth Fleet , the officials said . The basic RQ-4A Global Hawk UAV , manufactured for the U.S. Air Force by Northrop-Grumman , is the largest and most advanced drone in the U.S. military , according to the Navy . It is 44 feet long , has a 116-foot wingspan and weighs 25,600 lbs . The vehicles cost $ 176 million apiece , the Government Accountability Office reported in 2010 . Crashes are highly unusual , Navy officials said .
NEW : No one was hurt and no property was damaged , the Navy says . NEW : The drones cost $ 176 million apiece . Navy drone crashes near Salisbury , Maryland . The RQ-4A Global Hawk was on a training mission , the Navy says .