Malawi Police say they are still investigating opposition Malawi Congress Party (MCP) officials including its spokesperson Jessie Kabwila on allegations of treason, two months after they were arrested.
Police spokesperson Nicholas Gondwa said the police are yet to conclude the investigations.
"We are yet to arrest another suspect who is in UK, we are making arrangements to arrest the suspect," said Gondwa.
Police arrested MP Peter Chakwantha and Ulemu Msungama and Kabwila on allegations that they were planning to topple the government of Peter Mutharika.
The police based their charges on Whatsapp messanger chats among the four suspects, charges described by Malawi Law Society as laughable and other sections of society blamed the government for using state machinery to intimidate and harass the opposition.
The other suspect is said to be Lucy Chitembeya who is based in UK and actively participated in the Whatsapp group chat.