A senior Iranian legislator warned the western countries, specially the US, that the terrorists they support in different countries will not show mercy to their masters and will eventually attack them one day. \"The western states, specially the US, which use the terrorists as their mercenaries should know that they will not be safe from their threat,\" member of the parliament\'s National Security and Foreign Policy Commission Seyed Baqer Hosseini told FNA on Sunday. He referred to the two explosions which rocked the Boston Marathon in April, killed three people and injured more than 138 others and said the bombing displayed an instance of the US-backed terrorists\' cruelty against the American people. In relevant remarks in April, a senior Iranian commander lashed out at the US for its attitude towards terrorism in the world, and stressed that the recent explosions in the US city of Boston was the outcome of the performance and policies of the US statesmen. \"The US government is the source of the greatest state-sponsored terrorism and America is inevitably faced with the ugly side of this phenomenon (terrorism) as well,\" Deputy Chief of Staff of the Iranian Armed Forces Brigadier General Seyed Massoud Jazzayeri said. The commander condemned terrorist moves as \"inhumane\", and noted, \"Now in some parts of the world, terrorism is killing hundreds and thousands of the people and the world people see a clear and vivid example of it in Syria and Iraq and unfortunately the US administration is the source of this (terrorism in Iraq and Syria). Jazzayeri said majority in the US society are against the US statesmen\'s current imperialistic policies and are trying to bring a new order to power.