Webpolice in union city lifted the lockdown of the area near dowe avenue and alvarado niles road early thursday morning after the end of a standoff that started when an alameda. Webupon arrival, deputies made contact with an armed person who had barricaded themselves in a residence. After a brief standoff, the suspect surrendered. Weblagrange high school was on lockdown for several hours tuesday as police engaged in a standoff with a suspect located about a mile away.