A spokesman for federal police said two suspected attackers were arrested after the attack that took place at about 9 p.m. (3 p.m. ET) Thursday. However so far police have not given any indication as to the motivation or identities of those involved.
Around five people have been injured but police were not able to say how seriously.
One person was arrested but police didn't identify the suspect. The outlet quoted a transit agent describing the scene after a man leaped out of a auto and went on the attack.
Local media said several people had been attacked at the station.