In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

Nairobi, Kenya (CNN) -- In the worst single incident for Kenyan police in living memory, 38 officers were killed in northern Kenya over the weekend by heavily armed cattle rustlers, according to injured police reservists who were on the scene. Local media reports put the number at between 37 and 42 dead. Internal Security Minister Katoo Ole Metito would not give a total figure on how many police officers had died. Read more: Attack on Sunday school leaves child dead, others wounded The police officers were part of an operation to recover cattle belonging to the Samburu tribe that had been stolen by the Turkana tribe, according to the minister. They were ambushed in a valley when a large group of Turkana fired on police, leaving dozens dead and many injured.The officers were trying to recover stolen cattle, a security official saysThe Turkana and Samburu tribes have engaged in tit-for-tat cattle rustling operationsIt's not unusual to see cattle herders armed with automatic riflesThe security minster says the government is trying to reconcile the two communities
The Kenyan government intervened and gave an ultimatum for the _ to return the cattle last Friday, or it would respond with force.

President Barack Obama arrived in Japan on Wednesday for the first part of his Asia trip that started with reassuring Tokyo of U.S. support in its bitter territorial dispute with China. Obama made his first stop in Tokyo on a weeklong tour that will also take him to South Korea, Malaysia and the Philippines. Obama and Japanese Prime Minister Shinzo Abe met over what's been described as the "world's best sushi" at Sukiyabashi Jiro, a top-rated restaurant in the Ginza district. The dinner also brought out the new U.S. ambassador to Japan, Caroline Kennedy. On Thursday, Obama will start a formal state visit to the nation -- the highest designation for a foreign leader.President Obama says a set of disputed islands fall under a U.S.-Japanese treatyHe makes the comments to Japanese paper ahead of a visit to AsiaChina disputes his assertion, saying the U.S. should "respect the truth"
_ begins Asia trip with 'the best sushi I've ever had'.

Houston (CNN) Harvey is no longer a hurricane, but life-threatening flooding continued in and around Houston on Sunday night as citizens with boats assisted authorities in search and rescue efforts. Flooding from Tropical Storm Harvey is overburdening resources in the country's fourth-largest city, prompting authorities to call on volunteers with watercraft for help in rescuing those trapped in homes and buildings. An immediate respite from Harvey's wrath seems unlikely to come. The National Weather Service calls the flooding "unprecedented," and warns things may become more dire if a forecasted record-breaking 50 inches of rain does fall on parts of Texas in coming days. In anticipation of a worsening situation, Dallas is turning its main convention center into a "mega-shelter" that can host 5,000 evacuees.Dallas aims to open "mega-shelter" for 5,000 evacuees by Tuesday morningTwo storm-related deaths reported so far: one in Houston, the other in Rockport

The rainfall threatens to exacerbate an already dangerous situation, as _'s rains have left many east Texas rivers and bayous swollen to their banks or beyond.