Hundreds of Yemenis are rallying in a northern city, demanding the government arrest the kidnappers of nine foreigners who went missing last week, The Associated Press reported. Three of the kidnapped _ two German nurses and a South Korean teacher _ have since been found dead. Six others remain missing. Helicopters joined the search Wednesday in the northern Saada province. In Saada city, hundreds marched in a government-orchestrated protest. President Ali Abdullah Saleh has offered a $250,000 reward for information on the whereabouts of the kidnappers or the hostages.