IAAF president Sebastian Coe has described as "abhorrent" allegations that people in the sport have extorted money from competitors guilty of doping violations.
He also denied again that the governing body had been complacent in its handling of doping cases, as claimed by Britain's Sunday Times newspaper and Germany broadcaster ARD.
"That people in our sport have allegedly extorted money from athletes guilty of doping violations is abhorrent," said Coe in a statement on Saturday in his first response to the latest crisis to hit the sport.
Coe's comments came after French authorities this week placed former IAAF president Lamine Diack under formal investigation on suspicion of corruption and money laundering.
Diack, 82, is alleged to have received over one million euros ($1.09 million) in bribes in 2011 to cover up positive doping tests of Russian athletes, the office of France's financial prosecutor said.
One of Diack's sons and three other sports officials, two who held IAAF positions, have also been charged with ethical violations by the governing body.
"That they were not able to cover up the doping results is testament to the system that the IAAF and WADA (World Anti-Doping Agency) have jointly put in place," said Coe.
He promised stronger action by the IAAF during his administration.
"Where there are fragilities in the system that may have allowed extortion, no matter how unsuccessful, we will strengthen them," said Coe.
"And the independent integrity unit which I will establish next month will include an independent tribunal to hear all integrity-related violations committed by international level athletes and their support personnel.
"We will take the hearing process out of the hands of individual member federations."
Coe Struck back
Coe also struck back at critics who claimed the IAAF had not done enough to control doping.
"Every doping case currently being investigated by WADA was first identified by the IAAF through its athlete biological passport (ABP) program," he said.
A WADA independent commission is scheduled to announce on Monday their findings from a lengthy investigation into allegations of doping in Russia.
The report is expected to be critical of Russian sports officials and the IAAF.
"We are not complacent," Coe said. "Every athlete found in violation has been charged and sanctioned."
The Englishman, who has been criticized for not speaking out earlier after the French investigation of Diack, said the governing body has sought tougher penalties than those brought by the Russian officials.
"The IAAF believes the period of disqualification of results was too leniently applied by the Russian Federation and has been seeking an extension of these disqualifications through the Court of Arbitration for Sport (CAS) in fairness of clean athletes. The cases are currently pending," he added.
Coe said the IAAF had tested more than 5,000 athletes since 2009, proof the organization was serious about making the sport clean.
"The best way to cover up an anti-doping case is NOT to test athletes at all," he explained. "We will continue to lead the fight against drugs in sport on behalf of all clean athletes.
"Those that cheat will be caught. Those that are caught will be thoroughly investigated and the guilty will face the fullest sanctions available."