ABUJA, Nigeria — President Olusegun Obasanjo grounded two private Nigerian airlines Tuesday after plane crashes killed 224 people in seven weeks.

Blaming corruption for some of the industry's problems, Obasanjo also announced a review of all aircraft flying in Nigeria, saying experts would be brought in from the International Civil Aviation Organization.

One of the grounded carriers, Sosoliso Airlines, operated the McDonnell Douglas DC-9 that crashed Saturday in the southern city of Port Harcourt, killing 107 people, most of them schoolchildren.

The second carrier grounded, Chanchangi Airlines, operated a plane that skidded off the runway in Lagos earlier this year and another craft that returned to Abuja this month after developing problems following takeoff.

Obasanjo announced the groundings after meeting with airline carriers and government regulators to discuss public concerns over Nigeria's aviation industry.

"People are asking when will this stop? How will this stop?" the president told officials in the capital. "And we have to answer these questions."

Attempts to reach officials at the two airlines, which both operate only in Nigeria, were not immediately successful.

Obasanjo on Monday ousted two senior officials in Nigeria's aviation ministry.

A passenger jet crashed Oct. 22 shortly after taking off from Lagos, killing all 117 people aboard.

Despite its oil riches, wasteful and corrupt rule by military juntas has left much of Nigeria's public infrastructure in shambles. Obasanjo, elected in 1999 to end military rule, has vowed to weed out corruption.