Maharashtra’s Thane Police on Tuesday said they will investigate whether underworld don Dawood Ibrahim was involved in the extortion racket run by his brother Iqbal Kaskar, who was arrested on Monday.

“Whether Dawood Ibrahim had an indirect or direct involvement in this extortion racket run by Kaskar will be probed,” Thane Commissioner of Police Parambir Singh told reporters on Tuesday. Singh added that some politicians and corporators may also be involved in the extortion case.

Three people were arrested on Monday, and three others were being questioned, Singh said. Kaskar was picked up from his sister Haseena Parkar’s home in Mumbai. Kaskar and two others were sent to police custody for eight days by a Thane court on Tuesday.

Kaskar had allegedly demanded four flats and Rs 30 lakh as ransom from a builder, Singh said. The police are also examining whether the Maharashtra Control of Organised Crime Act can be applied to Kaskar and Dawood Ibrahim.

Kaskar threatened and made extortion calls to several other builders in Thane, Mumbai and Navi Mumbai, Singh said.

Kaskar was deported to India from United Arab Emirates in 2003. He was wanted in a murder case and the Sara-Sahara illegal construction case, in which two malls were built on state-owned land reserved for a municipal school. However, he was acquitted in both the cases in 2007.