Highlands Police Divisional Commander, Teddy Tei, said the duo were the driver and crew of the 25-seater bus, allegedly involved in the incident.
He said, their courageous action will ease tension between the two ethnic groups and normalize the situation along the Barola section of the highway in Eastern Highlands.
Mr. Tei said, the closure of the highlands highway following that incident by Barola people, has greatly affected business operations in the region.
The killing happened on September 12 and the highway was re-opened only a few days ago.
Relatives of the dead teacher in a petition, demanded 50-thousand Kina compensation from the State and Western Highlands Provincial Government.
Police have placed a permanent ban on night travel along the highlands highway.