Japan's industrial production fell a revised 2 percent in April from the previous month for the second straight monthly dip, against the earlier reported 1.7 percent decline, the Ministry of Economy, Trade and Industry said Wednesday.

The change is based on the index of output at mines and factories, which registered 99.7 against the 1995 base of 100, the ministry said.

It is the first time since July 1999 that the index has fallen below 100.

A ministry official blamed the downward revision mainly on miscalculations in some of the data used for compiling the preliminary figures.

The index of industrial shipments was revised downward to show a 2.8 percent fall from the initially reported 2.5 percent drop. The shipment index was 100.7, compared with the preliminary 101.

The index of inventories rose 2.2 percent to 100.3, revised from a 2.1 percent gain in the preliminary data.