There was more activity Friday at a troubled east Lawrence manufacturing plant that was shut down by the city for code violations.

City crews on Friday were on the site of MagnaGro International, 600 E. 22nd St., installing concrete barriers around portions of the building. The barriers, being put in place with a small crane, appeared to be designed to eliminate easy access to the building.

The city in July declared the former fertilizer mixing plant unfit for human occupancy because it is not connected to the city’s water and sewer service. In August, city officials confirmed that despite the order there was evidence people were still entering the building.

Friday afternoon Assistant City Manager Diane Stoddard confirmed the activity was an effort to better secure the building from unauthorized entry.

MagnaGro was the site of a double-fatality industrial accident in April, and has suffered several chemical spills. The city prior to that accident had disconnected the property from sewer and water service over concerns that the company was illegally dumping material into the city’s sewer system.