President Bush offered assistance Friday to earthquake victims in Iran, saying the United States cares about the suffering of the Iranian people even though there are major differences with Tehran about its nuclear program. "We, obviously, have our differences with the Iranian government, but we do care about the suffering of Iranian people," Bush said at a news conference with the leaders of Mexico and Canada. Three strong earthquakes and several aftershocks struck near two industrial centers about 210 miles southwest of Tehran. Officials said at least 70 people were killed and 1,200 others were injured. Bush emphasized opposition to Iran's nuclear program and said the world was united with Washington.