The Japanese government on Sunday for first time commemorated the day that the country ended the U.S. occupation and recovered its sovereignty in 1952 after its defeat in the World War II.
The government held a ceremony, in which the Japanese Imperial Couple, Prime Minister Shinzo Abe as well as about 390 lawmakers, prefectural governors and government officials participated.
On April 28, 1952, Japan recovered its sovereignty, except Okinawa Prefecture, as the San Francisco Peace Treaty took effect, putting an end to a seven-year occupation by the U.S.-led forces.
Okinawa, Japan's southernmost island prefecture that was returned by the United States in 1972, consider April 28 as "day of insult" and oppose the central government's sovereignty recovery ceremony.
The prefecture's governor Hirokazu Nakaima skipped the ceremony and local assembly members also staged protests in the city of Ginowan in the prefecture, according to reports.
At least 15 people were killed and 64 others injured in attacks across Iraq on Monday, mostly in the southern Shiite provinces, an Interior Ministry source said.
Two people were killed and 12 others wounded when a car bomb exploded in Karbala, some 110 km south of the capital Baghdad, the source told Xinhua on condition of anonymity.
Earlier on Monday, two cars bombs exploded in a market in Amarah, some 300 km southeast of Baghdad, killing nine people and wounding 30 others, the source said.
Another car bomb struck Diwaniyah, some 160 km southeast of Baghdad, killing two people and wounding 20 others.
In the northern town of Yathrib, some 40 km north of the capital, two soldiers were killed and two others wounded when unidentified gunmen attacked a check point of the Iraqi army.
Violence is still common in Iraq despite the dramatic decrease since its peak in 2006 and 2007 when the country was engulfed in sectarian killings.