It is not known how many individuals were involved in the attack , but two individuals are suspected .
Police closed off all entrances to the station in the immediate aftermath of the attack , but it was reopened at 9 PM with increased security .
aftermath is not known how many individuals were involved in the attack , but two individuals are suspected .
Police closed off all entrances to the station in the immediate aftermath of the attack , but it was reopened at 9 PM with increased security .