Turkish President Recep Tayyip Erdogan has criticised US President Barack Obama for his silence over the murder of three Muslim students in the US.

He said politicians were responsible for events in their countries and had to clarify their stance over them.

More than 5,000 people attended the funeral of the students who were shot dead in Chapel Hill, North Carolina.

With a suspect in custody, police are still investigating the motive, amid family claims it was a hate crime.

Initial indications are that the gunman, Craig Hicks, acted in a dispute over a parking space, according to the police.

A district prosecutor said on Wednesday there was no evidence that the victims - Deah Shaddy Barakat, wife Yusor Mohammad and her sister Razan - had been targeted because of their faith.

However, at Thursday's funeral, the local police chief said his force would investigate every lead, including the possibility of a hate crime.

The murders have resonated both within US and around the world, especially on social media. The hashtag ChapelHillShooting has been used hundreds of thousands of times.

Speaking on a visit to Mexico, Mr Erdogan criticised Mr Obama, Secretary of State John Kerry and US Vice-President Joe Biden for not having made any statement about the murder of the "three Muslims".

"If you stay silent when faced with an incident like this, and don't make a statement, the world will stay silent towards you," he said.

"As politicians, we are responsible for everything that happens in our countries and we have to show our positions."

Mr Erdogan is a devout Sunni Muslim who has been increasingly critical of the treatment of Muslims living in Western societies.

His relations with the Obama administration have also come under strain over the conflict in Syria and Iraq.

Turkey and the US are allies in the campaign against Islamic State militants, but differences over tactics have emerged over the last six months.