Herdsmen kill four taraba governors alarm

I think there may be a mistake here. It's unlikely that herdsmen killed four Taraba governors. Governors are high-ranking government officials, and it's not common for them to be killed by herdsmen or any other group.

Could you please provide more context or clarify what you mean by "alarm"? Are you referring to a specific incident or news report? I'd be happy to help you find more information or provide a more accurate response.