TOKYO (AP) _ Most major Japanese automakers lost a portion of domestic production last month because earthquake damage at a parts manufacturer forced temporary closures of some assembly plants, the companies said Tuesday.

Toyota Motor Corp., Honda Motor Co., Nissan Motor Co. and Mazda Motor Corp. were forced to halt production at some factories temporarily because key parts supplier, Riken Corp. in northwestern Japan, was damaged by the 6.8 magnitude earthquake that struck July 16, killing 11 people.

But most Japanese automakers also increased overseas production.

Toyota, which was forced to shutter all its plants in Japan for two days, said production in Japan fell 9.5 per cent to 379,863 vehicles in July from the same month a year ago.

But Toyota's global output rose 3.5 per cent to 736,750 units, with overseas production jumping 22.2 per cent to 356,887 vehicles.

The automaker has said it can make up last month's domestic production loss of 60,000 vehicles by the end of the year.

For the first six months of the year, Toyota and its group companies rolled out 4.71 million vehicles worldwide, bringing it closer to dethroning General Motors Corp. as the world's biggest automaker. The Detroit carmaker has been the world leader in auto production for 76 years, and has said its first-half production totalled 4.75 million vehicles.

By sales, Toyota already has the lead. It sold 4.72 million vehicles for the six-month period to June 30, compared to GM's 4.674 million vehicles.

Many analysts believe Toyota will surpass GM in global automobile production by year-end, as drivers look to its fuel-efficient models, including the Camry, the best-selling model in the U.S., and the Prius gas-electric hybrid.

Honda, Japan's second-biggest automaker, said domestic production dropped 11.1 per cent to 97,986 vehicles in July.

But Honda's global production climbed six per cent to 290,845 vehicles in July, thanks to a 17.6 per cent jump in overseas production to 192,859 vehicles.

Nissan, 44 per cent owned by Renault SA of France, said domestic output dropped 20.9 per cent to 85,976 vehicles for the month. Nissan's global production fell 3.7 per cent to 249,267 units, as overseas production climbed 8.8 per cent to 163,291 units.

Mitsubishi Motors was the only major automaker to post an increase in domestic production in July. The automaker's output in Japan edged up 7.7 per cent to 67,407 units last month, and overseas production rose 5.7 per cent to 47,170 vehicles.

At Hiroshima-based Mazda, an affiliate of Ford Motor Co. of the U.S., domestic output fell four per cent to 82,361 vehicles. Overseas production fell 23.3 per cent.