The EFCC has reacted and denied the pictures.

PUBLIC NOTICE: Disregard Fake Tweet on EFCC Port Harcourt Zonal Office Cell
These pictures purported to be the detention center of the Port Harcourt Office of the EFCC in a mischievous tweet by @TheRealDayne is fake.

The pictures in the tweet are strange to the EFCC, Port Harcourt Zonal Office.
That tweet is intended to mislead the public and the public is advised to discountenance it.
Thanks.