AUSTIN, Texas — The Biden administration has given border officials the green light to fill in some of the gaps in unfinished Trump-era wall projects, as well as resolving environmental issues and cleaning up remaining construction sites nearly a year after activity was halted.

Secretary of Homeland Security Alejandro Mayorkas announced Monday afternoon that he had granted U.S. Customs and Border Protection permission to move forward with projects in Arizona, California, and Texas. The new sign-offs are in addition to several that were announced in June and July to address “urgent life, safety, environmental, or other remediation required to protect border communities.”