A day after civic workers found 11 British-era hand grenades from a drain at Sion, 12 more grenades were found from a drain near Sion hospital on Thursday.
The police said the civic workers found the grenades while cleaning the drains between gate number 7 of the hospital and the crematorium.
“The grenades appeared to be empty as the clips had been removed from them. We are not very clear whether they contained explosives because these were laden with muck and garbage,” said Tulshiram Naagre, senior inspector of Sion police station.
The police said the grenades have been handed over to the Bomb Detection and Disposal Squad (BDDS) for investigation.
Brihanmumbai Municipal Corporation (BMC) officials said they have cleaned the nullah up to a depth of 80 ft.
The workers were cleaning the drains — a routine process before every monsoon to increase the water holding capacity of the drains — to mitigate the effect of water logging.
“We are not undertaking an inquiry in this. The police will,” said Assistant Municipal Commissioner Harshad Kale who has been given additional charge of the F-North ward.
The BMC has now decided to lay strict guidelines for the contractors undertaking the cleaning of the drains across the city.
The contractors will be asked to inform the police if the workers find anything suspicious.
“Since the cleaning of drains is being done in full swing across all the wards in the city, the contractors will be told to be careful and alert,” said a civic official, requesting anonymity.
The BMC has prepared a standard operation procedure, which lays down the guidelines for the contractors on want to do in case of an emergency.
The police said they are waiting for the report from the BDDS before deciding what to do with the grenades.
“So far, we have not come across any evidence to prove that these belonged to the British-era or that these have any heritage value. We are waiting for the report from the BDDS that would be arriving by Friday based of which future course of action would be decided,” Naagre said.
However, an officer said these grenades would be destroyed following examination.