Iran's top leader on Wednesday condemned the twin bombing attacks in Boston, yet chided the U.S. for employing a double standard when it comes to drone attacks that kill innocent civilians.

"The Islamic Republic of Iran, which follows the logic of Islam, is opposed to any bombings and killings of innocent people no matter if it is in Boston, Pakistan, Afghanistan, Iraq or Syria and condemns it," Ayatollah Ali Khamenei told Iranian military leaders he was addressing in Tehran.

Khamenei criticized the U.S. for killing people with drones in Pakistan and Afghanistan and backing forces that kill others in Iraq and Syria.

"What kind of logic is this that if children and women are killed by Americans in Afghanistan and Pakistan and by U.S.-backed terrorists in Iraq and Syria is not a problem, but if a bombing happens in the U.S. or another Western country, the whole world should pay the cost?" he asked in his comments, which were posted on his website.

Iran is the chief regional ally of Syrian President Bashar Assad and is considered close to Iraq's Shiite Muslim-dominated government.

Khamenei charged that such double standards would lead to the demise of Western civilization.

"Western civilization is on the verge of collapse and downfall because of contradictions, lack of logic, coercions and lack of care for human principles," he said.