Brian Mundubile, leader of the opposition in the Zambian parliament, speaks during an interview with Xinhua in Lusaka, Zambia. [AFP]
Zambian police summoned opposition leader Brian Mundubile late Thursday for questioning over an alleged national security threat, days after an election marked by a crackdown on dissent.
Mundubile finished second in the August 13 vote that handed President Hakainde Hichilema a second term and has vowed to challenge the results in court.
A joint team has "been carrying out investigations for the past few years relating to serious national security threats" and wanted to question Mundubile and his running mate, Makebi Zulu, a police statement said.
It did not specify the nature of the threats but said "alarming activities" that had the potential to undermine national security had occurred at premises linked to the pair.
Mundubile and Zulu have rejected police suggestions that their alliance was involved in insurgency or militia activity.
Mundubile went into hiding last week with an international human rights organisation after police raided his home in the capital, Lusaka.
A former cabinet minister, Mutotwe Kafwaya, was shot and killed during the August 14 operation when 11 people, including key opposition figures, were arrested on allegations of offences related to treason.