( CNN ) David Berry , one of 10 people killed during an attack on a luxury hotel in the Libyan capital , loved to live -- in the words of this father -- `` on the tip of the spear . '' `` David was a patriot . David was a warrior when he needed to be , and also a peacemaker , '' James Berry said about his son . `` He was intelligent and resourceful . He would not break down in a fight when liberty , freedom and justice was at stake . I lost a son yesterday , but I believe in what David did , and I stand proud of him while I privately mourn , '' he told CNN 's `` The Lead with Jake Tapper '' on Wednesday . The Libyan branch of ISIS has claimed responsibility for the gun and bomb attack that killed five foreigners , including Berry , an American security contractor . Five Libyans also died in Tuesday 's attack on the Corinthia Hotel , said a spokesman for a security division of the Ministry of Interior in Tripoli , Essam al-Naas . Two attackers were killed , he said , saying it appeared they were Libyans . The five-star hotel is known as one where foreigners and government officials stay and meet to conduct business . The Libyan branch of ISIS released photos of the two gunmen it said had carried out the attacks , identifying them as Abu Ibraheem Al-Tunsi and Abu Sulaiman Al-Sudani . Their naming convention indicates that the men were of Tunisian and Sudanese origin , respectively . The FBI is expected to open an investigation into the incident , two U.S. officials told CNN . According to military records , Berry was in the U.S. Marine Corps , completing six deployments in Afghanistan , Kuwait and Iraq . He retired in September 2012 , after a dozen years of service . He was working for Crucible , a security firm . According to its website , the Virginia-based firm `` provides high-risk environment training and global security solutions to employees of the U.S. government , NGOs , and multinational corporations who live and work in dangerous and austere locations worldwide . '' His father said Berry was fluent in Arabic and knew his way around the Arab world . `` He knew how to approach Arabic people on a foreign shore and not ... discriminate against them -- not come across as , ' I 'm am American warrior and I 'm going to do it this way . ' He was very conciliatory in nature , '' James Berry said . His son leaves behind a wife and four children . The other foreigners killed in the attack were a French citizen and three people from Tajikistan , al-Naas said . The French Foreign Ministry confirmed that a French citizen was among the dead but did not identify the victim . The Tripoli government , which is not internationally recognized , said the intended target of the attack was its prime minister , Omar al-Hassi , but the claim has not been confirmed . Al-Naas said that at least two Libyan security personnel were killed in the attack . An online group that supports ISIS said the attack was carried out in the name of Abu Anas al-Libi . He was an alleged al Qaeda operative accused of involvement in the bombing of U.S. embassies in Africa . He was captured by U.S. special forces in Tripoli in 2013 . He died in a U.S. hospital this month . It 's this declared link to al-Libi 's capture by the United States that has prompted the FBI to investigate . Fighters loyal to ISIS have for several months been in control of the Mediterranean port city of Derna in eastern Libya , near the border with Egypt . They are suspected in other attacks elsewhere in Libya , including in Tobruk , Al-Bayda and Tripoli . Tuesday 's attack began when militants detonated a car bomb in the parking lot of the hotel . The gunmen then shot their way into the hotel . The high-rise hotel is popular among government officials , some of whom live there . Until now , it was seen as one of the remaining secure locations in Tripoli for diplomatic and government activity . The attack , different in scale and coordination to those seen previously -- even after months of violence in Libya 's east -- sends the message that nowhere in the country , or its capital , is safe . Authorities say they are now in control of the hotel premises and are starting their investigation . The self-proclaimed Tripoli government , formed by a coalition of militias , holds sway only over the capital and surrounding areas . The internationally recognized parliament was forced to leave the capital after militia groups seized control of the city in the summer . The U.S. Embassy in Tripoli , the United Nations and other international organizations and businesses also evacuated their staffs from Tripoli in the summer due to the unrest . The U.S. State Department last week issued a warning advising U.S. citizens against all travel to Libya and recommending that any U.S. citizens currently in the North African country should leave immediately . `` Extremist groups in Libya have made several specific threats against U.S. government officials , citizens , and interests in Libya , '' it said . `` Because of the presumption that foreigners , especially U.S. citizens , in Libya may be associated with the U.S. government or U.S. Non-governmental organizations ( NGOs ) , travelers should be aware that they may be targeted for kidnapping , violent attacks , or death . '' CNN 's Dana Ford , Nima Elbagir , Mohammed Tawfeeq , Stephanie Halasz , Bob Hand , Evan Perez , Shimon Prokupecz , Barbara Starr and Laura Koran contributed to this report .
`` James Berry was a warrior when he needed to be , and also a peacemaker , '' David tells ISIS . Libyan branch of CNN claims responsibility ; names attackers . American security contractor is among five foreigners and five Libyan killed .