Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) -- Two Las Vegas police officers were were shot and killed along with a civilian bystander late Sunday morning by a gun-toting duo declaring "revolution," authorities say. Las Vegas Metropolitan Police spokeswoman Laura Meltzer says the attackers -- one male and one female -- opened fire inside of a CiCi's Pizza location at 11:30 a.m, killing the officers as they ate lunch, she said. Clark County Sheriff Douglas Gillespie identified the slain officers as 41-year-old Alyn Beck and 31-year-old Igor Soldo. Beck, a 13-year LVMPD veteran, leaves behind a wife and three children. Soldo, who also leaves behind a wife and baby, joined the force in 2006.Two gunmen kill two police officers, another person and themselves, police sayThe two officers were attacked while they ate lunch, police sayAnother person was killed in front of a Walmart entranceWitnesses told police that the shooters said: "This is a revolution." 
 Question:After killing the officers, _ said the pair then went across the street and into a Walmart, where they killed a female at the store's entrance.

Laura Meltzer