UPDATE 1-Eni says Nigeria break cuts oil output by 12,000 bpd

* Eni says its share of output cut is 2,400 bpd

* Cannot say how long Agip pumping station will be shut

(Adds details)

MILAN, Jan 5 (Reuters) - Italian oil and gas group Eni SpA (ENI.MI) said on Monday the closure of a pumping station in Nigeria following a spillage incident had reduced oil production by 12,000 barrels per day.

"The overall amount affected (by the incident) is 12,000 barrels per day and Eni's share of that is 2,400," an Eni spokeswoman said.

She said an explosion had occurred near Obama in the Nembe region of Nigeria following attempts to siphon off oil from pipelines illegally. The incident had resulted in the closing down of a pumping station run by Eni's Agip unit.

The Eni spokewoman could not say how long the pumping station would be halted.

Pipelines in Nigeria are frequently ruptured by gangs engaged in multi-million-dollar trade in stolen oil.

On Saturday the Nigerian military said saboteurs had blown up an oil pipeline operated by Agip in the Niger Delta late on Friday, adding it was not a militant attack.