COLOMBO (AFP) - At least three people including a Korean national were killed and about 25 injured near the Sri Lankan capital when a passenger train crashed into the back of another train, police said. Railway workers were still searching for passengers who might be trapped in the wreckage after the accident, which took place late Saturday close to a railway station in Alawwa, some 60 kilometers (35 miles) north of Colombo. "A Korean national and the engine driver were among those killed," police spokesman Maxi Proctor said.