The Garda Commissioner says they are considering terrorism and crime as lines of inquiry in the investigation into two fatal shootings in Dublin.

Noirin O'Sullivan says the force is keeping an open mind about the murders of David Byrne and Eddie Hutch Senior over the last week.

An armed Garda presence will remain in place around the city in the coming days and Gardai are appealing for information in relation to both murders.

Commissioner O'Sullivan says all options are being considered: