Petrol stolen twice from my Thunderbird near Babai Tiffin, HSR

Has anyone else experienced petrol theft around 19th Main Road, HSR (near Babai Tiffin)?
Over the last two weekends, I’ve parked my carburettor Thunderbird 350 there while grabbing breakfast, and both times I noticed petrol had been drained from the bike. I never expected to experience something like this in such a busy part of Bangalore.
Has anyone else faced this in the area? Also, what are the best ways to prevent petrol theft on a carburettor bike? Any advice would be appreciated.