Mumbai, Sep 3 - Mumbai broke out into a riot of colours, with dances on the street, loud music and revelry as lakhs of people turned up to bid farewell to their beloved elephant-headed god Ganesh here Thursday.

The immersion of the Ganesh idols after the 10-day annual festival has started on a peaceful note and there were no reports of any untoward incidents, Mumbai Police said.

Municipal Corporation of Greater Mumbai (MCGM), the Indian Navy, Coast Guard, social organisations, political parties and public groups geared up to oversee the immersion of an estimated 100,000-plus big and small Ganesh idols.

The immersion processions that have started moving out and the ceremonies are expected to continue on till Friday morning.

Shortly after the prayers at the noon, hundreds of Ganesh idols were taken out in big and small processions from every nook and corner of the city.

They wound their way to one of the 88 specific immersion sites prepared by the MCGM, the main among them being the Chowpatty, Mahim, Prabhadevi, Juhu, Versova and Marve beaches.

In addition, there are several other immersion sites, including the Mithi river inside the Sanjay Gandhi National Park in Borivli, Aarey Milk Colony, several small lakes, ponds and wells.

As in 2008, this year too the MCGM has created 17 artificial ponds for immersion of small-sized Ganesh idols to help ease the pressure on the major immersion sites along the sea front.

Mumbai Police have deployed over 25,000 personnel to monitor the immersion ceremonies all over the city.