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Amanda Lee Myers, Associated Press
Glass and sooty footprints can be seen around the front door front door of the Paradise Valley home of Lawrence and Glenna Shapiro in Paradise Valley, Ariz. Wednesday, Feb. 1, 2012. Police found two bodies that had been tied up and burned beyond recognition in the home on Monday and were still working to positively identify them. Police said Wednesday that investigators were not able to positively identify the bodies because they were so badly burned.

PHOENIX — Authorities have positively identified an elderly man and woman found tied up and burned in a posh Phoenix suburb as the owners of the home where the remains were discovered.

Police said Thursday that they used dental records to identity the couple as Lawrence and Glenna Shapiro, philanthropists who were in their 70s.

The crime has shaken Paradise Valley residents who were being told to lock their doors and pay attention to their surroundings. It's also unusual for police, who investigated the upscale town's last homicide in 2004.

Paradise Valley officers went to the home Monday morning after Phoenix police found a car on fire behind a strip mall about 20 miles away. The car was registered to the home's owners.

When an officer arrived at the house, she saw smoke coming from inside. Firefighters put out fires that had been set in two bedrooms, including the master bedroom, where the Shapiros' bodies were found.