The U.S. said on Tuesday it does not support a Pakistan-Iran gas pipeline project from going forward and cautioned about the risk of sanctions in doing business with Tehran, Reuters reported."We always advise everyone that doing business with Iran runs the risk of touching upon and coming in contact with our sanctions, and would advise everyone to consider that very carefully," a U.S. State Department spokesperson told reporters in a press briefing."We do not support this pipeline going forward," the spokesperson added, saying that Donald Lu, the State Department\'s top official for South and Central Asia, had said as much to a congressional panel last week.Pakistan\'s Petroleum Minister Musadik Malik said this week that his country was seeking a U.S. sanctions waiver for the gas pipeline from Iran.