Arabian Sea, PAKISTAN: Pakistani sailors stand on the Tipu Sultan warship during the multinational naval exercise 'AMAN 07' (Peace) in the Arabian Sea off Karachi, 08 March 2007. Naval warships from nine nations began a joint exercise in Pakistan aimed at boosting cooperation to combat terrorism at sea. The naval forces and warships of Britain, Bangladesh, China, France, Italy, Malaysia, Turkey and the United States are taking part in exercises along with host Pakistan. AFP PHOTO/Asif HASSAN (Photo credit should read ASIF HASSAN/AFP/Getty Images)

The first ever attack by the newly-announced Indian Subcontinent branch of Al Qaeda went really, really poorly. The attack launched last Saturday in Pakistan seems to have targeted the wrong ship.

Fighters of the Islamic terror group branch that was unveiled two weeks ago had planned to storm an American aircraft carrier at a Karachi port, but found a Pakistani Navy ship in its place, The Telegraph reports. The attackers suffered heavy casualties as the Pakistani Navy easily overpowered their attempt. Three of the al-Qaeda fighters were killed and seven were arrested according to Pakistani officials. Two Pakistani Naval guards were wounded.

"It was a complete failure, they did not do any kind of damage, some were captured and we caught more, seven so far and may be more to come. They were well-equipped and came with the intention of taking a ship into their custody but they were caught in the initial stages," an investigation source told The Telegraph.

Al-qaeda in the Indian Subcontinent (AQIS) claimed responsibility for the attack on Thursday, the anniversary of September 11. "The Naval officers who were martyred on Saturday in the attack in Karachi were al-qaeda members. They were trying to attack American marines and their cronies," a statement from the group's spokesman said. The group's statement alleged that attackers were able to take brief control of a frigate, contrary to what the investigation source Telegraph spoke with said. AQIS also asserted that the attackers were former Pakistani Navy officers.

Pakistani officials refuted AQIS' claim that all the attackers were former Pakistani Navy members, saying only one fighter who was killed in the battle had served. Officials were also skeptical that AQIS was even behind the attack at all.

Al-qaeda in the Indian Subcontinent was announced earlier in September by the group's leader Ayman al Zawahri, who claimed the new branch would spread Islamic rule and "raise the flag of jihad" across the subcontinent. It was seen as a move to impress the terrorist organization's prominence among Islamic militant groups, at a time when much of the world's attention is on the Islamic State, also referred to as ISIS or ISIL.

CORRECTION: A previous version of this article stated that militants intended to attack an American aircraft. The intended target was an American aircraft carrier according to reports.