Hamas terrorists will carry out attacks inside Israel if it invades Iran, the political leader of the Palestinian group said Thursday. "If Israel plans to invade Iran, then we will intensify our fight against Israel. We are in the same front," Khalid Mashaal told a press conference in Tehran. His comments came a day after Iranian President Mahmoud Ahmadinejad said the Holocaust was a "myth" that Europe had used to create a Jewish state in the heart of the Muslim world. Israel has denied plans to attack Iran, but it has joined the United States in alleging that Iran is trying to build nuclear weapons. Iran denies the charge, saying its nuclear program is only for the generation of electricity.