New Delhi, Mar 21: India's infrastructure sector witnessed a decline in growth at 3.9 per cent last month from 4.1 per cent in January and 4.4 per cent a year ago, mainly due to decline in production in electricity, cement and coal. The aggregate growth in six infrastructure industries -- crude petroleum, petro refining, coal, electricity, cement and finished steel -- was still at 5.2 per cent during April-Feburary this fiscal compared to 3.2 per cent in the year-ago period, according to official data released on Friday. Bureau Report