WELLINGTON, Jan 16 (Reuters) - New Zealand's Prime Minister said on Sunday that there were no official reports of injuries or deaths in Tonga as yet after a Pacific island nation was hit by a tsunami triggered by a massive undersea volcanic eruption.

Jacinda Ardern however said communications with Tonga were still limited as the eruption cut off the internet and phone lines to the whole country. Several coastal areas of Tonga were still uncontactable, Ardern said at a news conference.

(Reporting by Praveen Menon; Editing by Simon Cameron-Moore)