(Updates death toll)

CAIRO, Oct 5 (Reuters) - At least 13 Egyptians were killed when an intercity bus collided head-on with a truck on a highway south of Cairo on Sunday, and 21 others were injured, security and medical sources said.

Security sources said the bus had been trying to overtake another vehicle when it hit a truck travelling in the opposite direction near the town of Beni Suef.

The bus had been taking Egyptians from Giza, near Cairo, to Beni Suef following the Muslim Eid al-Fitr holiday that marks the end of the holy month of Ramadan.

Reckless driving, lax traffic rules and poor road conditions cause many road crashes in Egypt. A series of road and rail accidents has sparked a public outcry over the government's record on transport safety. (Writing by Cynthia Johnston; editing by Andrew Roche)

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