(CBS) Police investigating last week's coordinated attacks on Israelis in Kenya questioned three more men Wednesday, including one who said he recently sold the four-wheel-drive vehicle used in a deadly hotel bombing.

Meanwhile, CBS News Senior White House Correspondent John Roberts reports President Bush blamed al Qaeda for the attacks.

"I believe that al Qaeda was involved in the African bombings in Kenya. I believe al Qaeda hates freedom. I believe al Qaeda will strike anywhere they can in order to disrupt a civil society and that's why we're on the hunt," Mr. Bush said Wednesday.

However, White House officials admitted they do not have "conclusive courtroom proof."

Kenyan police detained two men Wednesday who witnesses said were near the Mombasa airport on Nov. 28 when a pair of surface-to-air missiles narrowly missed an Israeli charter flight — minutes before the attack on the hotel.

The seller of the car, a Kenyan of Somali origin, was detained in Mombasa late Tuesday. He told police he sold the green Mitsubishi Pajero to "two Arab-looking young men," who traded in a Toyota Corolla sedan and paid about $1,025, Deputy Police Commissioner William Langat told The Associated Press.

None of the men was identified. Langat insisted that none of those detained in the case so far, including 10 men picked up from a Somali fishing boat on the day of the blast, had been named as suspects. Authorities hope they might provide information that would lead to the actual culprits, he said.

On Monday, Langat told a news conference that the vehicle used in the bombing had been purchased in 1991 by a foreigner working for a Christian charity. It apparently remained registered in that name, although the foreigner left Kenya in 1998.

The vehicle exploded outside the Paradise Hotel near Mombasa. Ten Kenyans, three Israelis and at least two bombers died.

Langat said there was no information on a second four-wheel drive vehicle that was seen driving away from the spot near the airport where the missiles were fired — 12 miles south of the hotel.

The 10 men who were detained last week remain in custody, Langat said. Believed to be Pakistanis and Somalis, Langat said their status was somewhere between "suspects and not connected."

Ali Omar Haji Mohammed, the Somali owner of the fishing boat that arrived in Mombasa's port Nov. 23, said that among those detained were five Pakistanis he had hired in Karachi, where he bought the boat, and three Somalis.

He said that because the Pakistanis had no valid documents, he obtained papers for them in Somalia so they could make the trip to Mombasa to have the 50-foot vessel repaired.

Ali Omar said police have questioned him five times. On Tuesday, he said, two Americans went to his boat, moored in Mombasa's old port, asked him some questions and scraped blue paint from the hull and put it in a plastic bag. Israeli investigators also have visited the boat.

U.S. officials have pointed to the Somali Islamic organization al-Itihaad al-Islamyia, a group said to have ties to al Qaeda, as another probable participant in the attacks.

Quietly, sometimes unofficially, Israelis and Kenyans had cooperated for decades before last week's twin terrorist attacks.

Now many here are concerned that Islamic extremists have figured out that the ties make the Muslim minority Kenya a convenient battleground for their war against the West and Israel.

Israeli farmer Alex Burger is an example. He thought he had found tranquility in Kenya until last week.

Burger, one of more than 200 Israelis living in Kenya, now fears he and his family might also be targeted by the terrorists.

But Burger is not thinking of leaving. He said he came to Kenya four years ago to do business among people who are warm and accepting of Israelis.

"The place is excellent. It is possible to do business here, there are people here to do business with and it is a change from Israel," Burger said.

But Kenyans were already nervous before the attacks.

The Israeli embassy, a low building on a busy road next to a Catholic girls' school in the capital, has been turned into a fortress against attacks and many residents say it endangers the neighborhood.

Before the threat of terrorism soured the atmosphere, Kenya was a rare island of Israelis and Africans pursuing common interests. Israelis found business opportunities and Kenya benefited from the commerce.

When an Israeli combat unit flew to Entebbe, Uganda in 1976 to free a hijacked Air France airplane, Kenya gave Israel permission to use its airspace. At the time, Kenya had no diplomatic relations with Israel.

Between 1973 and 1988 — when ties were officially renewed — Kenyan students continued to come to Israel to study agriculture, public health and other fields, said Yoav Bar-On, head of the Israeli Foreign Ministry's East Africa department.

"We have very good relations on the government level and between the peoples of the two countries, by tradition, by common interest," Bar-On said.

About 20,000 Israelis visit Kenya every year. Many of the more than 200 Israelis living in Nairobi sell agricultural equipment and veterinary medicine. Israeli soups, juices and other products are available in supermarkets.

"There is almost no Israeli company that doesn't have a representative in Nairobi, no matter what they deal in," said Moshe Hirsch, director of the Paradise Geographic company that arranges trips to Mombasa for Israelis.