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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.