Image copyright Metropolitan Police
Image caption Khuram Butt booked a trip to Turkey, but his wife told an inquest she feared he would go on to Syria
The brother of the leader of the London Bridge attack has apologised on behalf of his family, saying he is sorry "from the depths of his heart".
Addressing the families of the eight people who were killed, Saad Butt said if he could turn back time he would change places with every one of them.
At the inquest into their deaths, he said his brother, Khuram, had been "the life and soul of the party".
But he developed extreme views after becoming angry over events in Syria.
Over the last four years he had become increasingly angry, Saad Butt told the inquest, over "foreign policy, the wars, the injustices overseas".
These "created the disgust in my brother's heart to the place which gave my brother safety," he said, adding: "Only God knows what he was thinking… We were from the same womb but we are different people."
Butt, 27, and two accomplices mowed down pedestrians on London Bridge with a rented van before stabbing people in nearby Borough Market on 3 June 2017.
All three men were shot dead by police less than 10 minutes after the violence began.
Mr Butt told the inquest: "Sorry. Sorry from the depths of my heart, and on behalf of my family.
"If I could turn back time I would change places with every one of you, even if it meant losing my life to my own brother."
Image copyright Press Association
Image caption The victims of the London Bridge attack clockwise from top left - Chrissy Archibald, James McMullan, Alexandre Pigeard, Sébastien Bélanger, Ignacio Echeverría, Xavier Thomas, Sara Zelenak, Kirsty Boden
The Old Bailey heard that the family had intervened in February 2015 to take away Khuram Butt's passport and that of his wife and baby boy because they were worried he would take them to join the Islamic State group in Syria.
"He wanted to fight the armed forces on behalf of ISIS," said Mr Butt but he said they persuaded him to drop his plans.
After that he said he continued monitoring his brother's activities, but never called the authorities.
He was at a barbecue just three weeks before the attack when a friend of Khuram Butt stuck a skewer into some meat and said "that is how you gut a Kuffar" - an unbeliever.
Breaking down into tears, Mr Butt described the early hours of the Sunday morning when he realised what his brother had done.
"His daughter was only one month at the time," he said. "Only God knows what he was thinking."
Those who died were: Xavier Thomas, 45, Christine Archibald, 30, Sara Zelenak, 21, Sébastien Bélanger, 36, James McMullan, 32, Kirsty Boden, 28, Alexandre Pigeard, 26, and, Ignacio Echeverría, 39.
The inquest continues.
