In Venezuela, military has been put on alert and security stepped up citing a 'terrorist attack'. <br/><br/>Venezuela's President Nicolas Maduro said that this step has been taken after a rogue police detective claimed responsibility for a grenade and gunfire attack on state institutions. <br/>'<br/>Authorities in the capital, Caracas, said several grenades were hurled at the Supreme Court from a helicopter and 15 bullets were fired at the interior ministry at sunset on Tuesday.<br/>'<br/>The attack was claimed in a video released online by a man identified by media and the government as 36-year-old Oscar Perez. <br/><br/>Earlier, many oponents on social media accused the President himself of trying to spread fear to help justify a crackdown against Venezuelan seeking to block his plan to rewrite the constitution. Venezuela is facing political unrest for more than a month.<br/>