It follows the holding of People’s Party Interim Leader Uladi Mussa at Lilongwe Police cell overnight, after he surrendered himself to the ACB.
Officers from the anti graft institution have been questioning him over his alleged involvement in a Passport scandal.
The passport gate is alleged to have occurred in the year 2012, when Mussa was home affairs minister.
Some opposition leaders are however expressing surprise with the move, arguing that the ACB has up to now not yet moved in to arrest Former Agriculture Minister George Chaponda after they found over 170 million kwacha and 58,000 US dollars stashed in his house.
Chaponda and other senior ADMARC officials are believed to have indulged in dubious activities during the purchase of 34.5 million US dollar maize with a Zambian broker Kaloswe Commuter and Courier.
On the other hand, critics are pointing out that the ACB cannot nab Chaponda as there are no charges laid against him.
Commenting on the issue George Mnesa who is Malawi Forum for Unity and Development President said the government was deliberately diverting the attention of the public from trending issues.
“I am surprised that Uladi Mussa is arrested on something which did not have much impact on Malawians unlike what Chaponda did, we expect both of them to be arrested for crossing the line in terms of the rule of law” Mnesa said.
Senior Public Relations Officer for the ACB Egrita Ndala dismissed the claims stressing that the ACB takes action only after careful investigations.
“Those two issues are different, we started investigating Uladi Mussa in the year 2015 after we received a complaint that is why we are arresting the suspects so that the case can commence in court” said Ndala.
Last week, the bureau arrested former Chief Immigration Officer Hudson Mankhwala over the same.