Sirens wailed at 2:46 in the afternoon as tens of thousands of mourners, many of them dressed in black, gathered to remember the dead in towns and villages along the country's devastated northeastern coast.

　　In the city of Ishinomaki, mourners gathered on a hill overlooking wrecked homes and businesses to pray for the nearly 4,000 people who died there on March 11, when towering waves swept away whole sectors of the coastal city. Organizers displayed 18,000 letters from children in the form of a giant rainbow spread across the ground.

　　Similar observances took place in towns and villages in Iwate and Fukushima prefectures, while hundreds of Tokyo residents staged anti-nuclear protests.

　　The magnitude 9.0 earthquake produced devastation not seen in Japan since World War Two, with the accompanying tsunami swallowing entire towns. The waves flooded the Fukushima nuclear power plant, triggering the worst nuclear crisis since the Chernobyl disaster of 1986.

　　Political fallout from the disasters forced Prime Minister Naoto Kan from office amid widespread accusations his government downplayed the scale of the nuclear crisis.

　　Authorities say 83,000 people remain in temporary homes six months after the disasters.  Nearly 7,000 people are reported still living in disaster shelters, as radiation fears from the shuttered Fukushima plant prevent area residents from returning home.

　　Police say the remains of 1,106 people remain unidentified.