The incident occurred at Enugwu-Ukwu in Njikoka Local Government Area.
Ubah represents Anambra South on the Young Progressive Party (YPP) platform.
A source said the gunmen ambushed the convoy and opened fire on its approach.
It was learnt that three of Ubah’s aides were killed; the others were security detail.
It could not be immediately confirmed whether the Senator escaped the attack or was not on the convoy.
A report said Ubah’s bulletproof car was riddled with bullets but he was able to flee.
It was learnt that the gunmen shot from various directions.
Anambra police spokesman, Ikenga Tochukwu, said the Commissioner of Police, Echeng Echeng, led security operatives to the area.
An eyewitness said: “I heard sounds of gunshots as if it was a war zone.”
A senior police officer said the exact number of those killed was yet to be ascertained.
It was learnt that the security detail’s arms were collected by the assailants.
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