The police are "seriously" considering a terror motive behind the tram shooting here which claimed the lives of three people and wounded five others earlier this week.
"A terrorist motive is being seriously considered. A letter found in the flight car and the nature of the events give cause for this. Other motives are not excluded and are also being investigated," the police said without revealing the contents of the letter, according to The New York Times.
Police arrested Turkish-born Gokmen Tanis on suspicion of the shooting, which took place in a tram at the 24 October Square on March 18.
The police earlier quashed speculations - which claimed that the shooting was sparked by a domestic incident - by stating that there is no indication of a direct relationship between the gunman and the victims.
Three of the wounded still remain in a critical condition, as two other men were arrested in connection with Monday's shooting.
The incident has jarred the nation as it came just a few days after 50 people lost their lives when a shooter opened fire inside two mosques at Christchurch on March 15.
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