Wiper leader Kalonzo Musyoka on Wednesday visited the Embakasi gas explosion victims.
The visit came on the very day one more victim succumbed to injuries raising the death toll to seven.
Over 280 other victims were left nursing serious injuries after a gas plant exploded in the Mradi area, Embakasi.
Kalonzo said that the leaders whom he will take legal action against bear the greatest responsibilities for the safety of Kenyans.
"I ask other legal entities to unite in this, my law firm can go on record along with others and we are clear we may have to sue Environment PS Festus Ng'eno and Energy CS David Chirchir," he said.
He said the victims should be compensated expeditiously and according to the levels of injuries and damages.
On Wednesday, the court ruled that the owner of the killer Embakasi gas plant and two Nema officials will be detained for 21 days to allow for police to conclude the probe.
The three are the plant's owner Derrick Kimathi and, NEMA officials Joseph Makau and Marrian Kioko.
They will be held at Embakasi Police Station.
The third suspect, David Ong'are, will however be held for 10 days with a maximum of 14 days, owing to his medical condition.
He will be detained at Capitol Hill Police Station.
Some victims in the Embakasi gas explosion sustained serious injuries and were admitted to the Kenyatta National Hospital.
Dozens of other victims have serious burns and are admitted to various hospitals in the city.
Some of the victims will undergo skin grafting for those with severe wounds.
The process involves transferring cutaneous tissue from one portion of the body to another to cover large wounds.