The Indian benchmark indices are likely to witness another volatile trading session ahead of the April future & options (F&O) expiry due later today. The investors’ sentiments will be further dampened by the weak global cues after the US posted slower-than-expected GDP growth in the first quarter of current year. Among the Asian markets, Japan’s Nikkei 225 was trading down by 380 points at 19,678, after the factory output dropped 0.3 per cent in March. Singapore’s Straits Times was trading at 3,469, down by 18 points; Hong Kong’s Hang Seng was at 28,182, down by 217 points; and China’s Shanghai Composite was also trading down by nearly 9 points at 4,468 in the early trading session. Back home, the BSE SENSEX closed at 27225.93, down by 170.45 points or by 0.62 per cent and the NSE’s wide-based Nifty ended at 8239.75, down by 45.85 points or by 0.55 per cent on Wednesday.