NAIROBI, Kenya (AP) _ A plane crashed during a trip to a game park in southwest Kenya, killing all nine West German tourists aboard and the Kenyan pilot, officials said today.

''We know there were nine German nationals who died in that crash,'' an official at the West German Embassy in Nairobi said. ''They were all holiday makers.''

The official, who spoke on condition of anonymity, declined to identify the West Germans until their relatives were notified.

Officials at Jomo Kenyatta International Airport in Nairobi confirmed the crash, but declined to identify the dead.

The aircraft crashed Thursday morning during an hour-long flight from Kenya's Indian Ocean coast town of Malindi to Amboseli National Park near the Tanzania border.

''The information I have is that the plane crashed in the Chyulu mountain range,'' Oliver Tavares, manager of the United Touring Co. office in Malindi, told The Associated Press in a telephone interview. ''There were no survivors.''

The trip was chartered through the Mombasa office of UTC, which is one of the largest travel and touring agencies in Kenya.

Tavares said the plane picked up four West German tourists Thursday morning in Mombasa, Kenya's second largest city and main Indian Ocean resort, and then flew to Malindi for the other five.

He said he did not know the make of the aircraft.