No one is believed to have been hit, and police stressed there had been no exchange of fire.
A petition against the "privatisation" of the Mirandole beach below the Saudi villa gathered more than 100,000 signatures in a week.
Athens initially plans to go without new loan from the fund.
Kurdistan Workers Party said fragile ceasefire that had been in place since 2013 with Ankara "no longer has any meaning".
Bars on foreign exchange transactions affect food supplies to zoos
Swedish news agency TT said the suspects were two men in their early 30s.
The leaves, held in the university's Mingana Collection, contain parts of chapters 18 to 20, written with ink in an early form of Arabic script known as Hijazi.