QUETTA: At least three security personnel sustained injuries in a landmine explosion in Mach area of Balochistan on Thursday, official sources confirmed.An official told APP that team of security men were checking the vehicles near the Much Bridge when one of the security men stepped on the landmine planted by the unknown men. Resultantly, three personnel injured and were moved to nearby hospital for medical aid. Condition of one injured is stated to be serious. Soon after the incident, local administration along with the law enforcers reached the site.