Abnormal volume on expiry day

On expiry day, there is surge in volume after 3pm in f&o stocks in cash segment. Can anyone explain reason behind it ?

Manipulators has played their part today… Everything should be curbed by strict regulations

I have observed surge in volume on many expiry day sessions in last 30 minutes, but I think manipulation is not the reason in this case.

I would suggest leave stock market altogether and find some other sources of income.

Closing whole week positions in last hour.

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Brokers close fno positions.

I meant volume in Equity cash segment.

Something due to arbitraging I guess.

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Yeah, arbitrage trades create huge volume. That might be the case.