By Dedi Hayun

JERUSALEM (Reuters) -Hundreds of cars abandoned in the scramble to flee a massacre at an Israeli music festival where Hamas gunmen killed 260 people and took captives back into Gaza underline the scale of the deadliest attack on Israel in decades.

Drone footage taken in the aftermath of the attack in Saturday's early hours showed cars left at the roadside, near Kibbutz Re'im close to Gaza from which Hamas launched its shock assault, many destroyed or pockmarked with bullet impacts.

"It was just a massacre, a total massacre," said 26-year-old Arik Nani, who escaped from the dance party, where he was celebrating his birthday after hiding for hours in a field.

"We didn't know where to go," he told Reuters. "I found myself with a friend, we found ourselves completely afraid and in shock, we ran just to understand what was happening to us."

Thousands of young people attended the Nature Party, which became one of the first targets of Palestinian gunmen who breached Gaza's border fence early on Saturday under cover of massive rocket barrages from Gaza.

Video footage circulating on social media shows the gunmen descending in paragliders on the gathering in the Negev Desert. Others came by road.

"There were two men on motorcycles on the road with Kalashnikov (automatic rifle) who started spraying us as we drove by," said Elad Hakim, who escaped in a speeding car with companions.

"The vehicles that were behind (us) were left behind."

Israeli emergency services said 260 bodies had been recovered from the site of the desert festival, where rows of wrecked and abandoned cars provided grim testimony to the scale of the attack.

At least 700 Israelis were killed and dozens more were abducted into Gaza in scenes that have shocked a country which had long prided itself on its ultra-efficient military and security services.

As well as the dead, more than 100 people were taken by the gunmen and dragged into captivity in Gaza.

"I was certain that we were being kidnapped," Hakim said. "I wrote to my parents, I sent my friend a recording for him to tell my parents that I didn't suffer and that it was... that it will be OK."

Other social media footage showed some of those taken captive from the party being led away by jubilant gunmen.

"I live on the Gaza border and I've seen things in my life, but I've never felt it this close," said 23-year-old Zohar Maariv, who had to jump out of the car she was escaping in when it came under fire from two sides.

"I have never felt so close to death," she said. "This time I really felt like it was the end."

(Writing by James Mackenzie; editing by Mark Heinrich and Tomasz Janowski)