After questioning nine sailors, including the vessel's captain Isha Hussain, SOG officials learnt that the heroin was loaded onto it in mid sea by Pakistan-based drug dealers as the ship headed towards Kenya from Sharjah.
The value of the seized narcotics is estimated to be around Rs 1,500 crore.
In a press release issued here today, the SOG claimed that the vessel 'Laxminarayan' is registered in Veraval and was rented by Salaya-based Haji Bashir Daud aka Raja.
According to sailors' statements given to the SOG, Raja oversaw the loading and asked Hussain and others to take a Pakistani sailor called Ashraf Mohammad with them to Mombasa port in Kenya, where the contraband narcotics was meant to be delivered.
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The sailors also claimed that men on the Pakistani boat did not reveal that the bags contained heroin.
When the vessel reached near Mombassa port in Kenya on March 23, the Australian Navy intercepted it and found heroin in the bags.
The Australian Navy seized the bags of heroin and released the sailors after telling that something "suspicious" was found on their vessel.
According to the SOG, the sailors were then let away by the Australian Navy, after which Hussain took the ship to Mombassa in Kenya and sought help of a local trader called Aliba, who arranged air tickets for all sailors.