forces backed by armored vehicles and military helicopters on Thursday laid a siege on an Islamists' stronghold near Giza Pyramids and exchanged fire with what official news agency identified as "terrorist and criminal elements." (AP Photo/Ahmed Ramadan)

Egyptian security forces help the lifeless body of Giza Police Gen. Nabil Farrag, center, who was killed after unidentified militants opened fire on security forces deployed early morning to the town of Kerdasa to drive off suspected Islamists taking control of the town near Giza Pyramids, Egypt, Thursday, Sept. 19, 2013. Egyptian security forces backed by armored vehicles and military helicopters on Thursday laid a siege on an Islamists' stronghold near Giza Pyramids and exchanged fire with what official news agency identified as "terrorist and criminal elements." (AP Photo/Ahmed Abdel Fattah)

A carBay City Circuit ahead of Sunday's Singapore Formula One Grand Prix on Thursday, Sept. 19, 2013. (AP Photo/Raymond Ho)

Circus artists Anastasiya Zorina and Eugeny Abakumov, top, perform during the opening concert in the new program in Ukraine's National Circus in Kiev, Ukraine, Thursday, Sept. 19, 2013. Sparkles are decorative pieces falling from the costume of Anastasiya Zorina. (AP Photo/Efrem Lukatsky)

A giant yellow duck sits at the Glory Pier in the port of Kaohsiung, Taiwan, Thursday, Sept. 19, 2013. Despite the heat, thousands flocked to the port of Kaohsiung, the first leg of the Taiwan tour, to see Dutch artist Florentijn Hofman's famous 18 meter (59 foot) yellow duck, a gigantic version of the iconic bathtub toy used by children around the world. (AP Photo/Wally Santana)