The ZCTU, secretary general, Wellington Chibhebhe, said Matombo was arrested while on a routine consultative meeting.
“He was arrested on Sunday while meeting the ZCTU structures in Victoria Falls. He was advising the structures on ZCTU’s position on various issues,” said Chibhebhe.
He is being charged under the Public Order and Security Act (POSA) for holding a meeting without police clearance and is detained at Victoria Falls Police Station.”
Matombo becomes the latest victim of the renewed clampdown on civic society, political and human rights activists.
Two weeks ago Cephas Zinumhwe, chief executive of the National Association of NGOs (Nango), and his colleague, DadiraiChikwengo,were arrested in the same town for "holding a public political meeting without approval.
The arrest of NANGO leaders followed hard on the heels of a clamp down on an MDC house in Harare by the police. The police, claimed to have been searching for weapons.
The MDC believes the latest round of arrests, are part of a plot by President Robert Mugabe’s Zanu PF party to silence its critics.
The MDC leader has asked President Mugabe to treat his party as an equal partner in the inclusive government, following a Southern African Development Community (SADC) troika meeting last week. Mugabe is currently in China attending an investment conference.