Zambian police are investigating charges of sedition and criminal libel against two journalists, raising concern that freedom of expression is under threat. Sipo Kapumba, a spokesman for the Media Institute of Southern Africa (MISA) Zambia, told IRIN the police had summoned Fred M'membe, editor of the privately-owned The Post newspaper, on 29 June after a series of editorials critical of President Levy Mwanawasa's government.