Ministry of Finance has issued a press release according to which due date for filing of Income tax return has been extended from 31.07.2018 to 31.08.2018. In a brief statement, they have not mentioned any reason for extension .The extension of due date is applicable only for taxpayers which are required to file their return on 31.07.2018 for Financial Year  2017-18
Read the CBDT Circular about extended e-File tax return instead of last date of E-File on 31/7/2018 to 31st August 2018 for the Financial Year 2017-18.

Click here to view or Download the Original Circular of CBDT