A mother beheaded by her son. A baby who suffocated after being stuffed by his parents in the baggage compartment of a motorbike while they played pachinko. A murderous shooting spree during a hostage standoff.

An outbreak of violent crime in the past week has triggered soul-searching and outrage in a country that has long prided itself on its safe streets and tight communal bonds.

The “appalling destruction” of traditional values — as one lawmaker put it — climaxed Friday, when a former gangster killed a police officer and wounded his son and daughter during a shooting rampage at his Nagakute, Aichi Prefecture, home where he had held his ex-wife hostage for 23 hours. It was the first time an on-duty police officer was shot to death since 2001.

The standoff capped a week of mayhem and mistreatment.

On Tuesday, a teenager strolled into a police station with his mother’s severed head in a bag. The same day, a 3-year-old child was abandoned by his father at an anonymous drop box meant for unwanted infants.

On Thursday, a couple was arrested after their 1-year-old son’s body was found wrapped in a plastic bag and dumped in a gutter. The baby died after his parents allegedly left him in the baggage compartment of a motorbike while they were in a pachinko parlor.

“We are witnessing the deterioration of Japanese society,” Liberal Democratic Party lawmaker Tsuneo Suzuki said in the Diet on Thursday. “We must stem this appalling destruction of family and community morals.”

While this is still a relatively safe country by international standards, crime is on the rise as society grapples with a widening gap between rich and poor and other social ills.

A tide of corporate layoffs amid widespread restructuring, the fragmentation of extended families and a creeping sense of urban alienation all contribute to the erosion of mores, experts say.

Japan, a country of 127 million people, had just 1,391 homicides in 2005, compared with 16,692 in the United States. But overall crime jumped to 2.27 million cases that year, from 1.81 million in 1996, and violent offenses nearly doubled to 73,772 cases, according to the National Police Agency.

“Anxiety is mounting in Japan about the increase of high-profile crimes. Due to rapid globalization, the traditional rules and social order are changing dramatically,” said Jun Ayukawa, an expert on criminal psychology at Kwansei Gakuin University in Hyogo Prefecture.

“While families used to act as brakes, there is an increase in crimes where people feel lost in despair and no longer care what happens to their families,” he said.

Indeed, fractured families figured prominently in last week’s grisly headlines.

Motoki Tamiya and his wife, Mika, both 21, were arrested Thursday after DNA tests of the dead 1-year-old linked the boy to his mother. The baby’s body was found last month on a remote road in Nose, Osaka Prefecture.

On Tuesday, Japan’s only anonymous drop box for unwanted infants triggered a wave of anger after it was discovered that a 3-year-old preschooler — and not a newborn — was left by his father on the service’s first day.

The dropoff, known as “Stork’s Cradle,” was begun by a Roman Catholic-run hospital in the city of Kumamoto to stem a wave of abandonments of newborns in unsafe public places.

The same day, there were more shocking headlines. A teenage boy carrying a severed head walked into a police station in Aizuwakamatsu, Fukushima Prefecture, saying he killed his mother — the latest in a series of dismemberments.

News reports said the 17-year-old suspect hacked off his mother’s head as she slept, then went to an Internet cafe to watch music videos — with the head — before turning himself into police in the morning.

In January, Tokyo was on edge after a woman confessed to cutting up her husband with a saw and dumping the body parts around the capital.

The recent surge in high-profile violent crime has spurred debate over tougher gun control rules, calls for strengthening the moral fiber of younger generations at the nation’s schools, as well as recriminations about the state of modern parenting.

Calls for more stringent gun control intensified last month when Nagasaki Mayor Itcho Ito was shot and killed by an organized crime boss. Days later, police stormed an apartment and seized another gangster who allegedly gunned down a rival outside a Tokyo convenience store.

The use of guns is still relatively alien to the Japanese public. Handguns are strictly banned, and only police officers and other professionals, such as shooting instructors, are permitted to own them.

Friday’s standoff ended when the gunman, Hisato Obayashi, 50, surrendered to police 29 hours after the standoff began.

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