LAS VEGAS (AP) — From shootings on the Strip to the killing of a liquor store clerk who couldn't open a safe to an April weekend that saw five slayings in separate cases, crime is spiking in the shadows in Las Vegas — and spurring questions about causes and cures. The local sheriff, police union officials and district attorney have various theories about what's behind the body count: 64 homicides by the end of April, compared with 29 killings after the first four months of 2015; 75 slayings as of Wednesday, compared with 45 by the same date last year. Lombardo, a 25-year Las Vegas police veteran, heads a department with 2,612 sworn police officers covering a city and most of a county with more than 2 million residents, plus more than 40 million visitors a year. — Two bystanders were grazed by police gunfire in a January shooting during an evening musical fountain show at the Bellagio resort. Security video showed three assailants entering the store, and cameras recorded the shooting death of a 24-year-old clerk who police said didn't have the combination to open the safe. The headlines have prompted second-guessing amid the police rank-and-file — including some who think dispersing gang detectives from a central office to the department's eight regional commands was a bad idea. Los Angeles also is seeing a spike in crime this year compared with 2015, said Kevin McCarthy, detective commander of a department with nearly 10,000 sworn police officers in a city of 4 million people — a ratio of 4 per 1,000.