Israel's military has recently identified several attempts to smuggle weapons into the Gaza Strip using drones.
The initial opening was intended to be on Sunday, day 14 of the hostage-ceasefire deal.
The border crossing is being opened earlier than expected due to the release of hostages on Thursday, which was not originally in the agreement.
The delivery was frozen by the Biden administration in May due to the Israeli operation in Rafah.
The ceasefire was meant to go into effect on Sunday at 8:30 a.m. local time but was delayed due to Hamas's failure to provide the list of names of the three hostages to be released on the same day.
Despite repeating his account twice, Alkadi's claims were dismissed. A few days later, the bodies of six hostages were discovered in the same tunnel.
"The Post" analyzes claims made by Prime Minister Benjamin Netanyahu during a comprehensive interview with "The Wall Street Journal."
"Israeli communities near the Gaza Strip are coming back to life. Residents are returning, and as they do, our responsibility grows even greater—not less."
An anonymous Palestinian described the ongoing suffering in Gaza, insisting Hamas must end it by releasing the hostages and ceding power.
Netanyahu's attorney Amit Haddad stated that recent security developments made proper defense preparations "impossible."