By SARAH EL DEEB Associated Press BEIRUT – Islamic State group militants destroyed the landmark ancient Tetrapylon and parts of the 2nd century Roman theater in Syria’s historic town of Palmyra, the government and opposition monitoring groups said Friday. Maamoun Abdulkarim, the head of Syria’s antiquities department, said the militants destroyed the facade of the second-century theater along with the Tetrapylon, a cubic-shaped ancient Roman monument that sits in the middle of the colonnade road that leads to the theater.