(Reuters) – A soccer stampede in Indonesia killed at least 125 people on the weekend, with 17 children among them, officials said, as pressure builds on the Southeast Asian nation to explain how one of the world’s worst stadium disasters unfolded. * Officers fired tear gas on Saturday night to disperse agitated supporters of the losing home side who invaded the pitch after the final whistle in the East Java town of Malang. Arema FC lost 3-2 to Persebaya Surabaya in the local BRI Liga 1 match. * About 42,000 tickets had been issued for a stadium designed to hold 38,000 people, Indonesia’s chief…