HARARE, Zimbabwe (CNN) -- Zimbabwe's prime minister believes the truck driver that struck his car and killed his wife deliberately drove toward him, his party told CNN Saturday.

Tsvangirai and his wife, Susan, were en route to the prime minister's hometown of Buhera.

Morgan Tsvangirai was in a stable condition and recovering from head injuries after the car accident on Friday that killed his wife, Susan, medical sources told CNN.

The crash, on a two-lane highway between Tsvangirai's hometown Buhera and the capital city Harare, comes only weeks after the start of a power-sharing agreement between Tsvangirai and his political rival, President Robert Mugabe.

Tsvangirai's political party, the Movement for Democratic Change, said Friday that it was too early to tell whether the crash was anything other than an accident.

But on Saturday, MDC members told CNN that Tsvangirai thought the crash was deliberate.

Tendai Biti, the MDC secretary-general, speaking during a tearful press conference, said Tsvangirai should have had better security.

"If there had been a police escort maybe what happened yesterday could have not have happened," Biti said. An MDC spokesman describes 'critical' accident »

"(A) Police escort would have warned oncoming vehicles of a VIP arriving. I think authorities must understand the omission.

"We hope that this omission will be rectified, that the prime minister must be given the protection that ought to be accorded to a prime minister."

Biti said the MDC would launch its own investigation.

Analysts say the crash will raise suspicions of foul play. One former U.S. diplomat called for an outside investigation, saying it was not the first time one of Mugabe's political foes had been killed or injured in a car crash.

Tsvangirai, Zimbabwe's main opposition leader, took office last month under a power-sharing deal with Mugabe following a contentious election.

Tsvangirai's MDC reached the power-sharing agreement with Mugabe in September after months of angry dispute that included violence. More than 200 deaths, mainly those of opposition supporters, were reported leading up to and in the aftermath of the election.

"I'm skeptical about any motor vehicle accident in Zimbabwe involving an opposition figure," said Tom McDonald, the U.S. ambassador to Zimbabwe from 1997-2001. "President Mugabe has a history of strange car accidents when someone lo and behold dies -- it's sort of his M.O. of how they get rid of people they don't like." Watch more on the fatal crash »

McDonald cited the 2001 death of Defense Minister Moven Mahachi, Employment Minister Border Gezi's death in 1999 and the death last year of Elliot Manyika, a government minister and former regional governor.

All three died in car crashes.

"This is several," McDonald said. "So, when I hear that Tsvangirai was in an accident, it gives me pause."

McDonald, now an attorney with the Washington law firm Baker Hostetler, urged a full investigation by outside authorities

However, he was quick to say that traffic accidents are common in Zimbabwe. The highway on which Tsvangirai was traveling is a two-lane where tractor-trailers are common, vehicles in the country are often in bad shape and drivers often are inexperienced, he said.

"It's certainly plausible that this was just one of those tragic things," he said.

The collision occurred on the Harare-Masvingo Road as Tsvangirai and his wife headed to his hometown of Buhera, south of the capital, Harare.