The rights group Amnesty International says Guatemala is failing to take action to stop an increase in murders of women.

The London-based group said Tuesday that 2,200 women and girls have been killed in Guatemala since 2001, adding that the murder rate has risen each year.

It said up to 70 percent of the crimes are not investigated, and no arrests were made in 97 percent of the cases.

Amnesty said there often are flaws in the few investigations that are started, and that Guatemalan authorities fail to protect witnesses.

The rights group called for tougher punishments against murderers, and improvements in the nation's witness protection program.

Some information for this report was provided by AP.