Foreign institutional investors (FIIs) were net buyers of Rs 387.27 crore (provisional) on Tuesday, according to data released by BSE. While FIIs made gross purchases of Rs 4,049.74 crore, gross sales totalled Rs 3,662.47 crore.Domestic institutional investors (DIIs) were net buyers of Rs 341.31 crore on Tuesday. While DIIs made gross purchases of Rs 1,593.63 crore, gross sales totalled Rs 1,252.32 crore.FIIs were net buyers of Rs 300.60 crore on Monday, December 10, according to data released by Sebi on Tuesday. While FIIs made gross purchases of Rs 3,128.60 crore, gross sales totalled Rs 2,827.90 crore.