Vincent Makori reports on the Shi'ite Houthi rebels have seized the central Yemen city of Taiz in a new escalation of the conflict in the Arabian Peninsula country. Nigeria's most tightly contested election is due this coming weekend. On Sunday the United Nations marked World Water Day. VOAâs Sonny Young discusses the Floyd Mayweather vs. Manny Pacquiao welterweight bout. Watch the show Monday-Friday @ 1630 UTC/GMT. Visit VOAnews.com and visit us on Facebook.