article_snippet.sent: Al-Shabaab's long, bloody legacy with Kenya .
article_snippet.sent: Kenyan security forces moved in and killed four gunmen.
article_snippet.sent: The dangerously porous border between Somalia and Kenya has made it easy for Al-Shabaab militants to cross over and carry out attacks.
article_snippet.sent: Last month, the U.S. Embassy warned of possible attacks "throughout Kenya in the near-term" after the reported death of a key Al-Shabaab leader, Adan Garaar, who was suspected in the September 2013 a December attack at a quarry.
article_snippet.sent: The effects are also being felt 225 miles west in Kenya's capital of Nairobi, where the new bloodshed reinvigorated an old debate: Is the nation's security strong enough?
article_snippet.sent: Civil liberty concerns had held up the enrollment of 10,000 new police recruits, but on Thursday, Kenyan President Uhuru Kenyatta gave a directive to process them.
article_snippet.sent: Kenya badly needs additional officers," Kenya said, "and I will not keep the nation waiting.
article_snippet.sent: The problems plaguing Kenya's security efforts .