Indy 500 champion Tony Kanaan was 13th after starting 19th in the 25-car field.
Kanaan was a sentimental favorite after several near-misses in his 11 previous Indy 500s.
"I got a little bit of luck today, " Kanaan said in a post-race interview.
The highest casualty toll occurred in Kanaan, Diyala, some 75km (47 miles) north-east of Baghdad.
In the rival Indy Racing League, Brazilian Tony Kanaan won the AJ Foyt 225 at the Milwaukee Mile.
South African Tomas Scheckter, son of 1979 Formula One champion Jody Scheckter, and Brazil's Tony Kanaan both crashed while leading.
For 20 years until 2002, Mr Kanaan virtually ruled Lebanon in his capacity as Syria's proconsul in the neighbouring state.
Kanaan's victory ended the domination of Team Penske and Ganassi Racing and gave Andretti Green their first win of the season.
The race featured a record 14 leaders and 68 lead changes, with Kanaan making the last one between the two caution flags.
One worshipper at the mosque in Kanaan said some 250 worshippers were leaving the mosque when the bomb went off near the gate.
Honda had quite a weekend with a 1-2 finish Saturday after a Chevy-powered car driven by Tony Kanaan won the Indianapolis 500.
Even if the UN sleuths' trail of clues stops at the door of Mr Kanaan, that may not get Mr Assad off the hook.
Getting a hoarder to stop is a complicated matter, says Debbie Kanaan, who oversees the animal cruelty division of the Los Angeles district attorney's office.
Tony Kanaan was third, followed by Michel Jourdain and Patrick Carpentier.
More damaging yet, the UN's investigation into Hariri's murder fingered the Lebanese security chiefs that Mr Kanaan had put in place, several of whom were arrested.
The ensuing peace, enforced by a security establishment that reported directly to Mr Kanaan, richly rewarded his friends, top Syrian generals and pro-Syrian Lebanese politicians alike.
Bowing to intense diplomatic pressure, Mr Assad let him question senior intelligence officials, including Mr Kanaan and his successor in Lebanon until the Syrian withdrawal, Rustum Ghazale.
Mr Kanaan was both a ruthlessly seasoned intelligence operator and a member of the Alawite minority that dominates Syria's power elite (and to which Mr Assad belongs).
No driver is allowed to pass another car while the caution flag is posted, so at that point, to win, all Kanaan needed to do was finish without crashing.
Brought back to Damascus as head of the Political Security Directorate three years ago, before becoming interior minister in October 2004, Mr Kanaan was a pillar of the regime.
International opprobrium forced Syria to pull out its troops and undermined the patronage network created by Mr Kanaan, such that the Lebanese elections this summer produced a determinedly anti-Syrian government.
The loss of such a stalwart figure in his wobbly regime seems likely to weaken it further, especially if Mr Kanaan's allies find it hard to swallow the official line that his death was suicide.
In the radio interview he gave minutes before his death, Mr Kanaan denied rumours reported in Lebanese media that he had handed the UN investigators extensive files on corruption in Lebanon during his tenure and had shown them photocopies of cheques he had received from Hariri.
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