Zambian opposition leader Brian Mundubile and his running mate, Makebi Zulu, have been taken into police custody for questioning over alleged treason.

• The arrests follow Zambia's August 13 election, where Mundubile placed second to incumbent President Hakainde Hichilema.
• Mundubile has alleged the election was fraudulent, a claim Hichilema denies.
• Police have recorded "warn and caution" statements, a precursor to formal charges for the serious offense of treason, which carries severe penalties.