Updated

An intense search for debris from the Malaysia Airlines Boeing 777 is underway 1,800 kilometers (1,118 miles) west of Perth, Australia. A list of the countries taking part and what they have sent to help the operation overseen by Australia from a military base near the southwestern city of Perth:

AUSTRALIA

Four military P-3 Orion planes; one helicopter; four civilian planes; three navy ships.

MALAYSIA

Two C-130 Hercules planes.

CHINA

Two Ilyushin IL-76 planes; three helicopters; seven ships.

JAPAN

Two military P-3 Orion planes; a coast guard jet.

NEW ZEALAND

One military P-3 Orion plane; one civilian plane.

UNITED STATES:

Two military P-8 Poseidon planes.

SOUTH KOREA:

One military P-3 Orion plane; a C-130 Hercules plane.