UN Secretary-General Antonio Guterres has expressed his serious concern over the series of cross-border terrorist attacks from Afghanistan against Pakistan, and asked the Taliban-ruled country to stop such incursions.Speaking at a news conference in New York, he expressed concern over the penetration of terrorists from Afghanistan into Pakistan.Replying to a question, the secretary-general said Afghanistan must control its territory and not allow terrorist groups from any other country to operate from Afghanistan.Source: Radio Pakistan