Japan's Chief Cabinet Secretary Matsuno Hirokazu has vowed to take steps to prevent a recurrence of Sunday's knife attack on a train in Tokyo.
Speaking to reporters on Monday, Matsuno called the attack "extremely heinous and malicious." A 24-year-old man is under arrest after brandishing a knife and starting a fire. The incident has left 17 people injured.
Matsuno said the transport ministry and police have instructed railway operators to make greater efforts to prevent such acts.
He said steps such as installing more surveillance cameras and the use of emergency call systems must be steadily advanced to ensure the safety of public transport.
Matsuno also said the incident revealed the challenge of how to evacuate passengers in such an emergency. He said this and other challenges should be addressed so that passengers can feel safe when they use public transport.