JERUSALEM>> Israel’s military said Wednesday it seized control of a strategic corridor along Gaza’s border with Egypt to cut off smuggling tunnels as it tries to destroy Hamas in a war that is now in its eighth month.

The capture of the Philadelphi Corridor could complicate Israel’s relations with Egypt, which has complained about Israel’s advance toward its border. Israel says the corridor is awash in tunnels that have funneled weapons and other goods for Hamas — despite a years-long blockade imposed by Israel and Egypt.

Israel also deepened its incursion into the southern Gaza city of Rafah, where hundreds of thousands have been seeking shelter from fighting, and where intensifying violence in recent days has killed dozens of Palestinians. The military said that a fifth brigade — up to several thousand soldiers — joined troops operating in the city Tuesday.

Egypt says any increase in troops in the strategic border area would violate the countries’ 1979 peace accord. It already has complained about Israel taking over the Rafah border crossing, the only crossing between Gaza and Egypt.

“The Philadelphi Corridor served as the oxygen line of Hamas through which Hamas carried out weapons smuggling into Gaza on a regular basis,” said Israel’s military chief spokesperson, Rear Adm. Daniel Hagari.

An Israeli military official said Israel had notified Egypt of the takeover. Some 20 tunnels, including some previously unknown to Israel, were found, as well as 82 access points to the tunnels, said the official, speaking on condition of anonymity in line with military regulations. It was not clear if the tunnels were in use.

The corridor is part of a larger demilitarized zone along the entire Israel-Egypt border. Under the peace accord, each side is allowed to deploy only a small number of troops or border guards in the zone, although those numbers can be modified by mutual agreement. At the time of the accord, Israeli troops controlled Gaza, until Israel withdrew its forces and settlers in 2005.

Egypt’s state-run Al-Qahera News TV reported there were “no communications with the Israeli side” on the allegations of finding tunnels on the border. Egypt repeatedly has expressed concerns that the Israeli offensive could push Palestinians across the border — a scenario Egypt says is unacceptable.

The narrow corridor — about 100 yards wide in parts — runs the 8.6-mile length of the Gaza side of the border with Egypt and includes the Rafah crossing into Egypt.

Hamas has had free rein of the border since its 2007 takeover of Gaza.

Smuggling tunnels were dug under the Gaza-Egypt border to get around the Israeli-Egyptian blockade, imposed after Hamas took over. Some of the tunnels were large enough for vehicles. Hamas brought in weapons and supplies, and Gaza residents smuggled in commercial goods, from livestock to construction materials.

That changed over the past decade, as Egypt battled Islamic militants in Sinai. The Egyptian military cracked down on the tunnels and destroyed hundreds of them.

The Israeli military official said Israel also has taken “tactical control” of Tel al-Sultan, a neighborhood on Rafah’s northwest edge. But he said the incursion into the city remains a “limited scope and scale operation.”

White House national security spokesman John Kirby said seizure of the Philadelphi Corridor would be consistent with the “limited” ground operation Israeli officials briefed President Joe Biden’s team on for the city of Rafah.

“When they briefed us on their plans for Rafah, it did include moving along that corridor and out of the city proper to put pressure on Hamas in the city,” Kirby told reporters Wednesday.

Meanwhile, deadly violence continued. The Gaza Health Ministry said an apparent Israeli strike killed two ambulance crew members on their way to evacuate casualties in Tel al-Sultan.