SAN JOSÉ -At least nine people were killed and four left missing when a bus and two other vehicles plunged into a ravine in a mountainous part of Costa Rica, the Red Cross reported Sunday.  The bus, car and motorcycle slid into the 75-meter-deep (245-foot) ravine on Saturday when heavy rain caused a landslide at the El Hundimiento mountain pass, around 80 kilometers (50 miles) west of the capital San Jose. Rescue services have pulled around 50 survivors, including the bus driver, from the gorge, according to the Costa Rican Social Security in charge of the country’s public health services.  “As of now, we know of nine people who did not have vital signs,” the Red Cross tweeted after the accident, adding that four people remain missing.  The bus was traveling between San José and Guanacaste Province with 47 people on board, the owner of the transport company, German Alfaro, told Costa Rican daily La Nacion.