An Austrian Foreign Ministry official says fighters from the Islamic State group have attacked an oil field in Libya and nine foreign workers are unaccounted for.

Ministry spokesman said Saturday that several security personnel were killed in Friday afternoon's attack at the site in Al Ghani, south of Sirte.

Weiss says security teams retook the site but nine foreign workers are unaccounted for including one Austrian, one Czech and the seven others, who are non-EU citizens.

No demands have been made by any group or individual for their return.