Somali militants Al-Shabab threaten Kenya retaliation
18 October 2011 Last updated at 02:51 BST
Somali militant group Al-Shabab has warned Kenya to withdraw its troops from Somalia, or face bloody battles.
Al-Shabab spokesman Ali Mohamud Rage told the BBC Somali service that his fighters would attack Nairobi.
Kenya launched an air and ground assault on the weekend, in response to several recent cross-border abductions it blames on Al-Shabab.
The BBC's Will Ross reports.