Strange lights - Waikato, New Zealand

Strange lights - Waikato, New Zealand
Time: 9.15pm, 12th April 

Location: Waikato/Waipa, New Zealand

Lights appearing to rise from behind mountain in the southwestern sky. Phenomenon occured for roughly 30mins at varying intensity of light and motion. Checked flight and satelite trackers, yielding no plane/helis/satelites in the area. 
Checked local UFO Facebook groups and found that the lights were seen by several witnesses across a reasonable distance, including a witness (who also captured footage)  on the west coast roughly 138km away who sighted them rising/moving over the open ocean at around the same time. Very similar phenomena documented by a witness almost exactly one week prior, occuring in the same orientation.