Pakistan's cricket chief on Sunday confirmed three Twenty20 internationals with the West Indies in Karachi early next month, taking a giant step towards reviving international series amid improved security in the country. Pakistan had been a no-go zone for international teams since a 2009 terrorist attack on the Sri Lankan team bus which killed eight people and left seven visiting players injured. Since then, Pakistan hosted two Twenty20 and three one-day internationals against Zimbabwe in 2015 but last year's final of the Pakistan Super League (PSL), three T20 internationals against a World XI and a T20 international match against Sri Lanka helped convince the West Indies. Pakistan Cricket Board (PCB) chairman Najam Sethi said the West Indies have confirmed the series.