JERUSALEM, Dec 29 (Reuters) - Israel declared areas around the Gaza Strip a "closed military zone" on Monday, citing the risk from retaliatory Palestinian rocket fire as an Israeli offensive in the coastal territory entered its third day.

The closure could also help Israel mount a surprise ground assault, should that be ordered. A military spokesman said the new policy meant that civilians, including journalists, may be barred from a buffer zone of 2km to 4km (1-2 miles) from Gaza. (Editing by Louise Ireland)

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