Foreign institutional investors (FIIs) were net buyers of Rs 348.20 crore (provisional) today, according to data released by BSE.While gross purchases totalled Rs 1,837.57 crore, gross sales added up to Rs 1,489.37 crore.Domestic institutional investors (DIIs) were net sellers of Rs 16.52 crore (provisional). They made gross purchases of Rs 769.64 crore, while gross sales totalled Rs 786.16 crore.