Crime reports are up significantly for the latest week in 15 L.A. neighborhoods, according to an analysis of LAPD data by the Los Angeles Times' Crime L.A. database.

10 neighborhoods reported a significant increase in violent crime. Porter Ranch (A) was the most unusual, recording four reports, compared with a weekly average of 0.3 over the last three months.

Westlake (K) topped the list of six neighborhoods with property crime alerts. It recorded 49 property crimes, compared with its weekly average of 34.5 over the last three months.

One neighborhood, Arlington Heights, triggered alerts for both violent and property crime.

Alerts are based on an analysis of crime reports for Jan. 25-Jan. 31, the most recent seven days for which data are available.