Investigation into the five Somali pirates, captured for hijacking a South Korean freighter, is in its final stages.

The special investigation unit is especially concentrating on collecting enough evidences on Arai Mahomed, who is accused of shooting the South Korean ship’s captain, Seok Hae-kyun.

Mahomed told the investigators on Saturday that he was carrying a firearm with him at the time, and this, the officials believe as a possible sign that he may confess to the shooting. However, the investigators are not only relying on Mahomed’s possible confession, but also focusing on securing enough evidences in case the Somali pirate denies the accusation in court.

Mahomed has been the focus of the investigation of the five pirates brought to South Korea Jan. 31. They were caught alive when South Korean naval commandos stormed the freighter to free the vessel and its 21 crew members. Eight other pirates were killed in the raid.

The investigation team will make a final announcement of its results on Monday and refer the case to the South Korean prosecution on Tuesday. If convicted, they could face up to a life sentence under South Korean law.