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³Ò²¹°ù»å²¹Ã­ (Irish police) are investigating if the suspected murder-suicide of a father and his two sons in County Cork was motivated by a dispute over a proposed will.

The bodies of Tadgh O'Sullivan, 59, and sons Diarmuid, 23, and Mark, 26, were found at a farm near Kanturk on Monday.

RTÉ has reported that a note running to about 12 pages was found on the body of Diarmuid O'Sullivan.

³Ò²¹°ù»å²¹Ã­ suspect he conspired with his father in the shooting, they said.

The alarm was raised on Monday when a woman aged in her 60s, believed to be the mother, alerted neighbours that a shot had been fired inside the house.

The body of Mark O'Sullivan was found in a bedroom before the bodies of his father and brother were found near a ringfort less than a mile away.

Two rifles discovered close to the ringfort have been sent for ballistic examination which police hope will reveal information about the sequence of events.

A post-mortem examination on the body of Mark O'Sullivan is due to be completed on Wednesday.

Formal identification of the men by a family friend is expected to take place on Wednesday.