In this Saturday, Feb. 21, 2015 photo, Libyan soldiers take a break from fighting with militants on the frontline in Al Ajaylat, 120 kilometers (75 miles) west of Tripoli, Libya.

Libya needs to form a unified government before the United States and European allies opt for any military intervention against thousands of ISIS fighters in the chaotic North African country, Egypt’s foreign minister said on Tuesday.

“This has to be a Libyan-led process,” Egyptian Foreign Minister Sameh Shoukry told Reuters in an interview, while acknowledging that efforts to forge a single government from two rivals in neighboring Libya have been “difficult.”

U.S. counter-terrorism officials have been alarmed at the growth of an ISIS affiliate in Libya, where it has amassed thousands of fighters, seized a coastal strip that includes the city of Sirte and attacked oil infrastructure.

The Arab country plunged into chaos in the aftermath of the uprising against longtime dictator Muammar Gadaffi, whose fall was helped by a NATO-led air campaign in 2011.

Speaking to the U.S. Congress on Tuesday, Director of National Intelligence James Clapper said ISIS Libya affiliate is “one of its most developed branches outside Syria and Iraq.” The affiliate, he said, “is well positioned to expand territory under its control in 2016.”

U.S. officials have debated increasing air strikes in Libya or deploying U.S. Special Operations Forces, but they say any military campaign is still weeks or even months away.

Shoukry suggested that international intervention without Libyan approval could backfire.

“The experience in the past … might have been met by the Libyan people with a little bit of concern, the outcome of the last intervention,” he said, referring to turmoil that followed in the wake of the West’s help in bringing down Gadaffi.

“I think we all recognize that this is an issue that primarily will have to be dealt with by Libyans,” he said.

Despite an agreement signed in December, Libya’s rival governments have failed to finalize arrangements for a Government of National Accord.

In the interview, Shoukry rejected growing criticism of Egypt’s human rights record.

Human Rights Watch last year cited estimates that authorities have jailed more than 41,000 people since President Abdel Fattah al-Sisi took power in 2014, after the military ousted Muslim Brotherhood president Mohamed Mursi the previous year.

Shoukry said he objected to “broad generalizations and the use of numbers that are not authenticated or verified.”

“There are certainly members of the Muslim Brotherhood who are in prison, who are facing trial for having perpetrated actions or activities that are not within the confines of the law,” he said.

“We are doing so in the context of a judicial system without any resort to any extra-judicial measures,” he said.

Egypt is fighting an Islamist insurgency in Sinai that gained momentum since Mursi’s ouster in mid-2013. Hundreds of soldiers and police have been killed.

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