A 5.9-magnitude earthquake struck an area near Tokyo early Sunday, injuring at least 37 people and disrupting traffic in the huge city, according to the Japanese Fire and Disaster Management Agency. The earthquake caused violent tremors in the Japanese capital and its surrounding areas, prompting the authorities to issue warnings and sound sirens in the streets, in addition to sending alerts via smartphones in the affected areas. The Japan Meteorological Agency said that the earthquake struck the southern part of Ibaraki Prefecture, near Tokyo, at two in the morning (17:00 GMT Saturday). The agency confirmed that there were no fears of a tsunami, noting that the earthquake was at a depth of 68 kilometers. The US Geological Survey estimated the earthquake's magnitude at 5.8. The Japanese Fire and Disaster Management Agency counted at least 37 people injured, most of them with minor injuries. The late earthquake caused train traffic in Tokyo to be disrupted, according to the East Japan Railway Company.