Foreign diplomats and journalists joined the family and friends of Anna Politkovskaya to mourn the Russian reporter who was gunned down in an apparent contract killing, as the Kremlin faces questions into her death.

More than 1,000 mourners attended Politkovskaya's funeral, held at Moscow's Troyekurovskoye cemetery on Tuesday.

The prominent investigative journalist and fierce critic of the Kremlin was found dead Saturday in an elevator inside the Moscow apartment block where she lived.

Politkovskaya, 48, became well known for writing about human rights abuses including torture against civilians in Chechnya -- abuses she blamed on the Moscow-backed Chechen Prime Minister Ramzan Kadyrov.

Her colleagues said Politkovskaya had been working on another story about the abuses and Kadyrov when she was killed.

"I dream of seeing him tried," she said in an interview days before her death.

Police are still looking for clues into her death. Many of her colleagues and some politicians say Politkovska's death highlights risks faced by journalists who dig deep to expose human rights abuses criticize Russian authorities.

The newspaper Novaya Gazeta where she worked offered a million-dollar reward for information that would help solve the crime. It also published a special edition on Monday, listing the journalist's major articles and inquiring into the cause of her killing.

"There is almost no investigative journalism left in Russia and I think that a lot of people will be scared, many of my colleagues will be afraid when entering their houses," Alexei Venediktov, Head of radio station, "Ekho Moskvy" (Echo Moscow) said Tuesday.

"They will be constantly looking over their shoulders. In this sense, it is an enormous loss and an enormous pressure on journalism in Russia."

No high-ranking Kremlin or government official made an appearance at the funeral on Tuesday. U.S. Ambassador William Burns was in attendance.

On Monday, Putin pledged that authorities would do everything to find Politkovskaya's killers.

In a phone conversation with U.S. President George Bush, Putin pledged that "all necessary efforts will be made for an objective investigation into the tragic death" of the journalist, the Kremlin said.

Prosecutor-General Yury Chaika is in charge of the investigation, but colleagues of Politkovskaya have expressed doubts the murder will be solved.

Kadyrov, meanwhile, expressed condolences over her death, and denied any "Chechen trace" in the killing.

Politkovskaya's death was the most high-profile slaying of a journalist in Russia since the July 2004 assassination of Paul Klebnikov, the U.S.-born editor of the Russian edition of Forbes magazine.

According to the New York-based Committee to Protect Journalists, Russia is the third deadliest country for journalists after Iraq and Algeria. Politkovskaya was at least the 43rd journalist killed for her work in Russia since 1993, says the committee.

With files from The Associated Press