The South East senators in a statement in Abuja, through its Chairman, Senator Enyinnaya Abaribe, said on Sunday:
"The 1999 Constitution, as amended, provides for the freedom of association and the right of the people to freely assemble to express their common interest.
"The last time I checked, that section of the constitution is still intact and has not been amended. It is, therefore, worrisome that the rights of a section of Nigerians would be so wilfully denied with such extra force.
"If the report of killings by the security agencies were to be confirmed, it would, no doubt, leave a gaping hole in the unity of this country.
"This is one regrettable action too many, coming against the backdrop of the recent report of the Amnesty International (AI) of mass killings of people from the same section of the populace in Nigeria."