Martin McGuinness' funeral took lace at Saint Columba's Church in his native Derry
Large crowds followed Sinn Féin politician's coffin through the Bogside to the church
The paramilitary turned peacemaker died on Tuesday after a short illness, aged 66
Ex-US President Bill Clinton, the Irish president and Taoiseach attended the funeral
DUP leader Arlene Foster was applauded as she entered the church
Ciaran McCauley
BBC News NI
Those gathered at the church could hear loud applause from the crowds gathered in the Bogside at the bottom of the hill below, where Martin McGuinness' funeral procession is making its way to the church.
Mourners applauded the arrival of Mr Clinton and Mr Ahern.
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Former US President Bill Clinton and former Taoiseach (Irish Prime Minister) Bertie Ahern arrived together at the church for the funeral service.
Ciaran McCauley
BBC News NI
As well as Mrs Foster, NI secretary James Brokenshire and PSNI chief constable George Hamilton have taken their places in the Long Tower Church.
Bishop Donal McKeown greeted many of the VIPs before they were whisked past the waiting media and gathering mourners in to the church.
Mrs Foster looked up and smiled to acknowledge the applause she received as she took her seat.
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DUP leader Arlene Foster received a round of applause as she entered the church.
Image source, Getty ImagesThursday's newspapers were dominated by the funeral and speculation about whether or not she would attend.
DUP MLA Robin Newton is one of the MLAs attending the funeral.
Martin McGuinness' coffin is draped with the Irish tricolour.
Tony Blair, prime minister during the Northern Ireland peace process, says Martin McGuinness was always very clear why peace at that time was consistent with the principles of republicanism.
Tony Blair says what made McGuinness a formidable foe also made him formidable peacemaker
Watch Mr Blair tell the Today programme how what made McGuinness such a "formidable foe" during the armed struggle made him such a "formidable peacemaker" later.
Mr McGuinness' hearse took him through the streets of his native city.
He was second in command of the IRA in Derry when members of the Parachute Regiment shot dead 13 civilians in the city on Bloody Sunday in January 1972.
Relatives of IRA victims have been angered at the tributes that have been paid to Mr McGuinness since his death. As a senior commander within the Provisional IRA for many years, there is no doubt there was blood on his hands, writes our home affairs correspondent Vincent Kearney .
Since his death, Martin McGuinness has been compared by some to the former IRA leader Michael Collins. Both men made deals with the British government that fell far short of the united Ireland they wanted.
Image source, Getty ImagesPolitical historians Dr Eamon Phoenix and Michael Foy are discussing the legacy of both men on the BBC's Talkback programme. Dr Phoenix agrees there are parallels and says that like Collins, Mr McGuinness began look for "stepping stones" to reunification - through ceasefires and institutions with north-south bodies.
Political correspondent Gavin Reily tweeted earlier about the large crowd that have lined the streets to pay their respects.
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Fr Gary Donegan (3rd from left) and Stephen McGeehan (4th from left) from Ulster GAA are among the crowd.
The hearse carrying the Sinn Féin politician's body has made its way to the church.
Mourners have come out in large numbers to pay their respects to Mr McGuinness.
The Northern Ireland Secretary of State, James Brokenshire, is representing the UK government at Mr McGuinness' funeral.
DUP leader Arlene Foster and former DUP minister Simon Hamilton have arrived in Derry for the funeral of Martin McGuinness.
Mrs Foster's predecessor, Peter Robinson, is also attending the ceremony.
Also at the service are the Green Party's Steven Agnew and Claire Bailey.
The SDLP's Colum Eastwood and Mark Durkan are seen here talking to Bishop Donal McKeown, the bishop of Derry.
