Abnormal Ping

I play on mumbai servers and i usually have about 30-40ms and 50ms on Singapore, However from today i have an abnormal ping around 80-100ms on mumbai servers alone, i still have the usual pings on other servers.
I use an Airtel ISP and i am very sure its not a problem from my end as i have seen others post similar issues on twitter as well. Please look into it Riot