Sensex closes 344 pts lower, Nifty ends below 10,150 on expiry day; Airtel down 7%

Sensex closes 344 pts lower, Nifty ends below 10,150 on expiry day; Airtel down 7%: Sensex closes 344 pts lower, Nifty ends below 10,150 on expiry day; Airtel down 7%. Sensex and Nifty — the benchmark indices of the domestic equity markets