 President Abdul Kalam, his hand raised to his forehead in salute, led the two-minute silence as people lit candles and placed wreaths at Mahim station, one of the seven places on the suburban rail network hit by bombs.Sirens sounded across Mumbai marking the memorial service.People gathered at the site of the blasts, in railway stations on the city's Western Line, traffic came to a halt, It interrupted films and observed a moment of silence to pay homage to the victims.