"Sameer and Arjun were summoned to appear before the Crime Branch this morning after which they were placed under arrest," Inspector General of Police, V Renganathan told reporters.
"Since they had already secured pre-arrest bail from court, they were released on (furnishing) surety," he said.
Sammer and Arjun are directors of Kantilal and Company,the iron ore exporter firm which was named by the Directorate of Mines and Geology in their FIR filed before the SIT.
The brothers were granted anticipatory bail by the Panaji district court on August 31, 2015.
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An FIR was registered against them by SIT on September 15, 2014 under various sections of the Mineral Concession Rules, 1960, r/w section 21(1)(2) of the Mines and Mineral (Development and Regulation) Act, 1957 and section 2 r/w 3A of the Forest (Conservation) Act, 1980.
In their application seeking pre-arrest bail, Sameer and Arjun had claimed that neither them nor their firm had committed any offence.
According to police, Anil Salgaoncar, Arjun, Sameer and other directors of Kantilal and Company, along with former Urban Development Minister Joaquim Alemao and others allegedly extracted iron ore at Asni Donger, Curdi and Curpem in Sanguem taluka in illegal manner during 2006 and 2011.