Mumbai, Oct 5 (PTI) An unidentified person called up Sir H N Reliance Foundation Hospital in south Mumbai on Wednesday and threatened to blow it up, a police official said.<br> "The caller also issued threats in the name of some members of Ambani family," he said.<br> The person called up the hospital's landline number at 12.57 pm from an unknown number, the official said.<br> An FIR has been registered at D B Marg police station against the unidentified person and an investigation is on into the matter, he added.<br> In August this year, a jeweller was arrested after he allegedly calling up the hospital and threatened to kill industrialist Mukesh Ambani and his family members.<br> In February 2021, a sports utility vehicle (SUV) laden with explosives was found near Ambani's south Mumbai residence 'Antilia'.<br> Later, some people, including the then-police officer Sachin Waze, were arrested in connection with the incident. PTI ZA<br> <br>GK GK