Memorial held in Imola for Senna and Ratzenberger

F1 chaplain presides over memorial mass on 20th anniversary of Senna and Ratzenberger deaths

GRAND PRIX SENNA

FILE - In this November 4, 1989, file photo, Brazilian driver Ayrton Senna, in a McLaren Honda, pulls on a fire resistant mask before going out to practice for the Australian Grand Prix. Senna won three Formula One titles

Brazil Senna

FILE - In this May 1, 1994, file photo, Race officials run toward Brazil's Aytron Senna after he crashed with his Williams-Renault during the San Marino F-1 Grand Prix in Imola. Senna died at a Bologna hospital later. Nearly three years after the fatal crash, six top Formula One figures, including Frank Williams, head of the successful Williams-Renault team, face manslaughter carges in a trial starting in Imola Thursday, February 20, 1997. (AP Photo/file)

Italy F1 Senna 20 Years

A man lays flowers next to a statue of Ayrton Senna, in a park close to the Imola track, Italy, Wednesday, April 30, 2014. It is a testament to Ayrton Senna's lasting impact on Formula One that the 20th anniversary of his death will be observed this week with five days of commemorations at the Imola track where he had his fatal accident. Current and past F1 drivers, mechanics, racing officials and fans will pay their respects to Senna and Austrian driver Roland Ratzenberger, who also died at the 1994 San Marino Grand Prix. (AP Photo/Marco Vasini)

Italy F1 Senna 20 Years

A Brazilian flag and flowers adorn a statue of Ayrton Senna, in a park close to the Imola track, Italy, Wednesday, April 30, 2014. It is a testament to Ayrton Senna's lasting impact on Formula One that the 20th anniversary of his death will be observed this week with five days of commemorations at the Imola track where he had his fatal accident. Current and past F1 drivers, mechanics, racing officials and fans will pay their respects to Senna and Austrian driver Roland Ratzenberger, who also died at the 1994 San Marino Grand Prix. (AP Photo/Marco Vasini)

Italy F1 Senna 20 Years

A child walks past a giant poster showing Ayrton Senna, at the Imola track, Italy, Wednesday, April 30, 2014. It is a testament to Ayrton Senna's lasting impact on Formula One that the 20th anniversary of his death will be observed this week with five days of commemorations at the Imola track where he had his fatal accident. Current and past F1 drivers, mechanics, racing officials and fans will pay their respects to Senna and Austrian driver Roland Ratzenberger, who also died at the 1994 San Marino Grand Prix. (AP Photo/Marco Vasini)

IMOLA, Italy (AP) -- Fans and family members are gathering this week to pay their respects to former Formula One drivers Ayrton Senna and Roland Ratzenberger on the 20th anniversary of their deaths.

F1 drivers' chaplain Sergio Mantovani celebrated a memorial mass Wednesday in a packed room beside pit lane at the Enzo and Dino Ferrari track that once hosted the San Marino Grand Prix.

Ratzenberger's parents Margit and Rudolf sat in the front row and were wiping tears from their eyes on the exact anniversary of their son's death.

Ratzenberger, an Austrian rookie, was killed in qualifying on April 30, 1994 and Senna, a three-time F1 world champion, died the next day during the race.

Margit Ratzenberger says, "It's hard for me. But I have to be here to remember my son."