不発弾の危険性もあることから警察に通報し、現場にテープを張って立ち入りを防いでいる。

、。

Due to the danger of unexploded ordnance, police were notified and the area was cordoned off with tape to prevent entry.

Literal

Unexploded-bomb [possessive-の] danger [also-も] exists [reason-ことから] police [to-に] reported, scene [to-に] tape [object-を] stretched entry [object-を] preventing.

不発弾 (unexploded ordnance/UXB) is a compound specific to wartime remnants — still found in Japan today. ~ことから (because of the fact that) is a formal causal connector. 立ち入りを防ぐ (prevent entry) is official language. The sentence chains multiple actions in sequence: report, cordon, prevent.