Athens, Rabi'II 26, 1437, February 05, 2016, SPA -- Greek police estimated that hundreds of thousands of people took to the streets Thursday in nationwide strikes against pension reforms and tax increases demanded by the country's creditors, according to dpa. Greek media described the action as the largest in years, with one radio station reporting that it was "easier to say who is not on strike, than who is." More than 100,000 demonstrators marched through the centre of Athens, where additional police were deployed as the government feared riots. There were afternoon clashes between police and a group of about 500 masked demonstrators described as anarchists. The massive general strike was called by both private and public sector unions, and is being joined by Greeks from a wide range of occupations. Greece has been required to implement tough economic reforms in return for international bailouts that have prevented the country from going bankrupt. One of the creditors' biggest demands under the current rescue package has been reform of the pension system. --spa 03:13 LOCAL TIME 00:13 GMT www.spa.gov.sa/w