There were reports on social media that a luxurious bus conveying commuters of Igbo extraction was set ablaze, killing 230 passengers in Jos.
One AK-47 rifle and 12 rounds of live 7.62X39mm caliber ammunition were recovered from the scene of the crime.
The legislators who visited hospitals where victims were being treated, condemned the killings.
The evacuation became necessary following recent attacks and killings in Jos and environs, following sectarian violence.
The Plateau State House of Assembly asked Governor Simon Lalong to speak up on the killings and outline his measures to stop it.
Yelwa Zangam community was attacked by gunmen on Tuesday night.
Many students and staff of UNIJOS had come under a series of attacks with many reportedly killed.
Plateau State has been under siege since some travellers were killed in the Rukuba axis of the state while on transit from Bauchi to Ondo State on August 14.
The group is planning another round of evacuation on August 21 for Abuja indigenes schooling in Jos.
The university management said since the 24-hour curfew in the state was relaxed, there have been intensified killings of its students.
