Members of Palestinian security forces loyal to Hamas salute as they are deployed to maintain security on the border of southern Gaza Strip with Egypt, April 21, 2016.

The militant Hamas group deployed forces on Thursday along the Egypt-Gaza border to counter Cairo’s concerns that it is aiding ISIS extremists in Egypt’s lawless Sinai Peninsula.

Egypt accuses Hamas, which rules the Gaza Strip, of providing a safe haven for the ISIS affiliate in Sinai through a network of smuggling tunnels. Hamas denies the charge.

Hamas and a high-ranking Egyptian security official said the deployment is part of an agreement reached with Egyptian officials last month.

“This emphasizes the Palestinian stand to tighten security on the border and nothing that harms Egypt will come out of Gaza,” said Hamas spokesman Sami Abu Zuhri.

The Egyptian security official said the deployment is part of the new deal with Egypt that sees Hamas halt tunnel construction in return for opening the Rafah border crossing, Gaza’ s main gateway to the outside world. The official spoke on condition of anonymity because he wasn’t authorized to speak to the media.

On Thursday, armed Hamas men took up positions along the 13-kilometer (8-mile) border, with fighters in pick-up trucks patrolling back and forth.

Relations between Hamas and Egypt soured after the 2013 military ouster of Islamist President Mohammed Morsi. Hamas is an offshoot of Morsi’s Muslim Brotherhood movement.

Egypt has been battling ISIS militants and in 2014 launched a fierce campaign on the underground tunnels with Gaza, destroying many of them. It has also kept the Rafah crossing largely sealed. Abu Zuhri said he hopes that the deal will lead to the crossing’s reopening.

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