A plane crash in Costa Rica on Sunday killed 10 U.S. citizens and two local pilots, the Costa Rican government said. The cause of the crash was not yet known, the country and amp;#39;s security ministry said. It took place in the mountainous area of Punta Islita, which is popular with tourists, in the province of Guanacaste, about 230 km (140 miles) west of the capital of San Jose.
