By Ahmed Rasheed and Isabel Coles BAGHDAD (Reuters) - Iraqi security forces backed by Shi'ite militias on Sunday broke the two-month siege of Amerli by Islamic State militants and entered the **rthern town, officials said. The mayor of Amerli and army ******rs said troops backed by militias defeated fighters from the Islamic State (IS) to the east of the town. Fighting continued to the **rth of Amerli in several villages. "Security forces and militia fighters are inside Amerli **w after breaking the siege and that will definitely relieve the suffering of residents," said Adel al-Bayati, mayor of Amerli.