Three labourers were today trapped when an under-construction wall of a water harvesting structure collapsed on them at Moti Dungari area here, police said.
 
Rescue operation was on and JCB machine has been pressed into service to remove the debris, additional SP (East) Omprakash said.
 
About ten labourers were working at the site when the wall connected with the under ground structure, about ten feet deep, suddenly collapsed.
 
The construction work was being carried out by Jaipur Municipal Corporation and Jaipur Development Authority, he said.