Three railway workers were arrested on Friday in connection to the deadly multi-train collision in India that killed at least 290 people and injured hundreds more last month, The New York Times reported. The Coromandel Express, a high-speed passenger train, crashed into a freight train in Odisha carrying iron ore then derailed, causing it to ram into another train with more than 2,000 riders. Officials said that a signal error caused the devastating incident, but did not rule out the potential for sabotage. It remains unclear whether it was a technical failure or a human error. The workers have been detained on charges of endangering the safety of passengers, culpable homicide without murder, and tampering with evidence. India’s Central Bureau of Investigation identified the workers as a senior section engineer, a section engineer, and a technician.