The duo staged a protest during the launch of Samoa Airways flights to Brisbane.
They shouted abuse and threw items at the prime minister, including an uncooked pig's head.
Tuila'epa was unharmed.
He said the paramount concern was that Samoans "at home and abroad remain calm with peace and the rule of law prevailing".
The prime minister called the protest a "childish attempt to embarrass all Samoans which failed miserably".
Source:
RNZ Pacific