The US Coast Guard is actively pursuing a third oil tanker near Venezuela, an official told CBS News. This follows two tanker seizures this month, including one on Saturday. The new pursuit involves a “sanctioned dark fleet vessel that is part of Venezuela's illegal sanctions evasion,” said a US official. This ship is reportedly flying a false flag and is under judicial seizure. Washington accuses Venezuela of using oil money to fund drug-related crimes. Venezuela calls the tanker seizures “theft and kidnapping.” Last week, US President Donald Trump ordered a “blockade” on sanctioned Venezuelan oil tankers entering or leaving the country. Venezuela has the world's largest proven oil reserves and accuses the US of trying to steal its resources. US authorities have not confirmed the new tanker’s name or location. Data shows over 30 of 80 ships near Venezuela are under US sanctions. Saturday's seizure involved a Panamanian-flagged tanker in international waters. It carried “sanctioned PDVSA oil” but is not on the US Treasury’s list. It also sailed under Greek and Liberian flags previously. Venezuela said “These acts will not go unpunished.” They plan to file complaints with the UN Security Council and other agencies. Venezuela depends heavily on oil exports for government finances. Recently, the US increased military presence in the Caribbean and struck boats it says were drug smugglers, killing about 100. The military gave no public proof these boats carried drugs. US Congress is questioning these strikes. The Trump government accuses Venezuelan President Nicolás Maduro of leading a terror group named Cartel de los Soles, which he denies.