Rescuers working beneath leaden skies pulled bodies from rivers of mud Thursday as they searched for survivors of record-breaking monsoon rains that killed more than 500 people.

A stampede set off by rumors of a dam burst late Thursday also killed at least 15 people, including seven children, and injured more than 25 in a Bombay shantytown, said R.R. Patil, deputy chief minister of Maharashtra state.

People in the Nehru Nagar slum in northern Bombay panicked after hearing the rumors in the wake of landslides set off by two days of rains that began Tuesday and buried alive dozens of Bombay residents and cut off neighboring villages.

Officials said 273 people have died in Bombay since Tuesday when the cosmopolitan city that is home to India’s financial and movie industries was hit by an unprecedented deluge of up to 37.1 inches of rain in some areas, the highest recorded one-day total in India’s history.