Security forces have blown up 3,000 pounds of homemade explosives, the largest bomb cache ever found in Northern Ireland, police said. The explosives, discovered during a routine search, were packed into 52 plastic bags and stored in a manure spreader on a vacant farm near the village of Beragh, 50 miles west of Belfast. Police said they believe the outlawed Irish Republican Army planned a major bomb attack. "Had it (the explosives) gone off in a built-up area, it would have caused devastation," a police spokesman in Belfast said. "The consequences would have been horrific."