District and Session Judge E Kharumnuid sent Dorphang, an independent legislator who is supporting the ruling Congress in the state, to 14 days judicial custody after the five-day police custody ended.
Dorphang, who had co-founded an armed organisation until he gave up arms in 2007, was arrested from an inter-state bus terminus in Guwahati and booked under section 366(A) of IPC, sections of the Protection of Children from Sexual Offences Act (POCSO Act) and Immoral Trafficking Prevention Act (ITPA).
Police did not seek extension of his custody as the legislator was cooperating with the investigators and claimed he has admitted to his crime.
At least two FIRs were filed in two districts against the legislator for allegedly sexually exploiting the girl in two locations in these districts on several occasions, police said.
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The victim was rescued from near the guest house and brought to the police station where she allegedly named all those involved in exploiting her.
Women activists have been demanding that Chief Minister Mukul Sangma should drop Lyngdoh to allow a free and fair probe in the case.
Meanwhile, Dorphang's aid and a former militant Elbert Shemphang Kharlukhi and another person Nirdesh Jain were arrested for their alleged involvement in the sex racket also involving the same girl, police said.
He was today remanded in five days police custody.
Kharlukhi was arrested today from near the SP's office, he said.
With the two arrests, a total 11 persons, including Dorphang, have been arrested till date, he added.