Queen Elizabeth and her husband visited Ireland.
The queen wore green when she arrived in Duplin, in her historic four-day visit.
Her first official commitment is the wreath-laying ceremony at the Garden of Remembrance in Dublin City center which honors those who struggled for Irish freedom from British rule.
A pump bomb was detected in the luggage compartment of a bus, on its way to Dublin.
Police and soldiers are on duty to safeguard the queen and her husband.