United States President Barack Obama on Wednesday pledged US assistance to his Turkish counterpart Recep Tayyip Erdogan for the investigation into last week's attempted coup, the White House said.

During a phone call, Obama 'strongly condemned' the violent uprising and 'urged that the investigations and prosecution of the coup's perpetrators be conducted in ways that reinforce public confidence in democratic institutions and the rule of law,' it said in a statement.

Obama 'lauded the Turkish people's resolve against this violent intervention and their commitment to democracy,' the White House said. 'President Obama made clear that the United States is willing to provide appropriate assistance to Turkish authorities investigating the attempted coup.'