Subscribe | UPI Odd Newsletter Subscribe April 11 (UPI) -- Mysterious teardrop-shaped balloons that sparked speculation of foreign surveillance or UFO activity over Phoenix were identified as weather-monitoring equipment. Residents of the Phoenix area snapped photos of the balloons floating high in the sky over the city, and some initially speculated they could be Chinese surveillance equipment or UFOs from outer space. Advertisement "Happened to be outside sweeping the pool and looked up and saw it," Greg Schultz, who spotted a balloon near Estrella Mountain, told KTVK/KPHO. "It was kind of teardrop-shaped, kind of silver-clear." The objects have since been identified as three Thunderhead weather balloons operated by company Aerostar. "I can confirm that Aerostar is currently operating Thunderhead balloon systems in the Phoenix area. These balloons are in the stratosphere, so well above the weather we typically experience at ground level," an Aerostar representative said in a statement provided to KSAZ-TV. Read More World's most expensive sandwich returns for Grilled Cheese Day Stuck squirrel rescued from manhole cover in German city Rare bontebok antelope born at Oregon Zoo
