German chancellor Angela Merkel has started a debate in her country with her statement that multiculturalism has "utterly failed."

Merkel's words also led to a controversy over immigration.

The chancellor has long been skeptical of Germany's attempts to build a multicultural society that includes its estimated 5 million Muslims.

Merkel said that immigrants were more than welcome in Germany. But she added that they must learn the language and adapt to German culture.

Some industry leaders argue the rules should be relaxed because they need skilled immigrants for their businesses.

However, critics say the existing laws are flexible enough.