More than 60,000 people dead. Millions forced to flee their homes. And thousands of refugees spilling out of the country every week.

The humanitarian nightmare in and around Syria is spiraling out of control. But some say funding for those affected is woeful at best.

The United Nations and world leaders tried Wednesday to tackle the issue at a fund-raising event in Kuwait.

The pledging conference was to address shortfalls in a $1.5 billion goal to help Syrian refugees and those affected inside the country, the U.N. humanitarian affairs office said.

"So far, only a small percentage of the funding for 2013 has been received, limiting the ability of U.N. agencies and their humanitarian partners to reach people who desperately need help," the U.N. office said this month.

But getting the money is only part of the struggle.

The global aid group Doctors Without Borders, also known as Medecins Sans Frontieres, said there's an imbalance in who gets help inside Syria.

"International aid provided to Syria is not being distributed equitably between government and opposition controlled areas," the group said in a statement Tuesday. "Areas under government control receive nearly all international aid, while opposition-held zones receive only a tiny share."

Doctors Without Borders has helped supply makeshift medical clinics in opposition-held areas. The group estimates about one third of the country -- roughly 7 million people -- live in areas beyond government control.

"Essential items, such as shelter, blankets, fuel, flour and infant formula, are in short supply. Unofficial health services are targeted by government forces and struggle to meet the needs of numerous wounded and chronically ill people," the group said.

But the International Committee of the Red Cross said it's doing its best to make sure aid gets delivered fairly.

"Usually when we do the distribution, we try to be present, or if we can't because of the security measures, we monitor the distribution very closely," spokeswoman Dibeh Fakhr said Wednesday.

"The security is deteriorating very rapidly, and this is why we are not present everywhere in the country. But we are doing our best."

Countries across the world step up aid

Kuwaiti Emir Sheikh Sabah al-Ahmed al-Sabah kicked off the conference Wednesday by announcing a $300 million donation.

Other pledges followed, including Germany with $10 million, the United Arab Emirates with $300 million and Bahrain with $20 million.

On Tuesday, U.S. President Barack Obama announced an additional $155 million in aid for Syrians inside the country and the more than half-million refugees who have fled. The new funding brings the total U.S. pledge to $365 million.

The United States has imposed sanctions against the Syrian government and backed the opposition. But the United States and other nations have refrained from intervening militarily in the civil war.

Violence wracks the country unabated

As the flow of aid increases, so does the need.

Warplanes pummeled cities across Syria on Wednesday as cluster bombs rained down over Idlib province, the opposition Local Coordination Committees of Syria said.

Thirty-nine of the 144 deaths tallied Wednesday were said to have occurred in Aleppo, where the LCC said artillery shells targeted the neighborhood of Eastern Ansari.

Russia's Foreign Ministry called for an investigation, according to Russia's state news agency Itar-Tass. "We urge all parties to contribute to ceasing armed violence in Syria as soon as possible," spokesman Alexander Lukashevich said Wednesday.

Cluster bombs explode in the air, sending dozens or hundreds of smaller bombs over an area the size of a football field, according to Human Rights Watch.

More than 70 countries have signed a treaty banning the use of cluster bombs, but neither Syria nor the United States is among them. The Syrian government has denied using cluster bombs the current conflict.