Norwich — City fire officials and police are investigating the cause of an early morning fire Friday that engulfed the Capehart Mill at the end of Fifth Street in the Greeneville section, the latest in a series of fires that have plagued the vacant complex over the years, including one six weeks ago.

No injuries were reported.

The Norwich Fire Department was dispatched to the scene at 5:16 a.m., joining police who found fire and smoke coming from the mill complex’s north building, according to the fire department, which issued a news release early Friday afternoon.

Norwich Engine 2 and Battalion 1 responded to the initial alarm, and additional resources from the city’s volunteer fire departments answered a second alarm.

Severe overgrowth and the deterioration of an access bridge over a canal complicated efforts to reach the site, Battalion Chief Gregory Despathy wrote in the release. There was no indication that the building was occupied.

Also responding were the Taftville, Yantic, East Great Plain and Laurel Hill volunteer fire departments. The Mohegan Tribal Fire Department and Norwich Public Utilities provided assistance as well.

By 6:20 a.m., the fire had been brought under control, with crews continuing to extinguish hot spots. The last Norwich companies left the scene at 9:34 a.m.

Firefighters battled a May 25 fire that engulfed the mill complex, extinguishing the flames in about two hours. No was injured.

In April 2010, an arson fire destroyed much of the complex. Norwich police arrested six people in connection with the fire, which took three days and 7 million gallons of water to extinguish. Years before, vandals stealing copper from a transformer on the property caused an oil spill that sent PCB-contaminated oil seeping through the soil and into the Shetucket River. State and federal agencies led cleanup efforts.