San Bernardino achieved international notoriety last December, when 14 people were killed in an Isis-inspired mass shooting at a local business centre. But the California city has long had one of the state’s highest murder rates and, in the months since that attack, San Bernardino’s streets have seen a surge in everyday gun violence that police and residents are struggling to explain.

By late April, just over 100 days into 2016, more people in the troubled city had been shot dead than were killed in the December 2014 massacre. According to a new report by the Los Angeles Times, by the end of August there had been 150 shootings and 47 homicides in San Bernardino this year, compared to 44 overall in 2015 – including those who perished in the mass shooting.

The city is now expected to see more murders in 2016 than in any year since 1995, when 67 people were killed. San Bernardino has approximately 216,000 residents but has suffered approximately the same number of homicides this year as Oakland, which has more than 410,000. On top of the 47 homicides, three people have also been shot dead by police.

If the drumbeat of deaths continues over the coming months, the city will see out 2016 with a homicide rate of 31 per 100,000 residents. Chicago, where the epidemic of gun violence has received widespread attention, had a rate of 18 homicides per 100,000 residents last year. Almost half of those killed in San Bernardino this year have been black, though black people make up just 14 per cent of its population.

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There are mixed explanations for the sudden spike in violence. San Bernardino declared bankruptcy in 2012 and its police department has been decimated by budget cuts. There are approximately 215 police officers serving in the city, compared to more than 340 in 2008. Fewer than 40 per cent of this year’s murders have been solved.

The decline of employment opportunities and cuts to other services may also have contributed to the violence, the LA Times reported, with some residents blaming small but significant issues such as the lack of working street lights in some neighbourhoods.