The Syrian government pounded the country's largest city Thursday, using aerial forces to shell neighborhoods and intensifying the siege that has become a focal point of the country's civil war.

Meanwhile, in neighboring Lebanon, another person was kidnapped in an incident believed to be linked to the violence in Syria.

And amid growing concerns about the scores of deaths daily in Syria, the U.N. observer mission in the country is coming to an end. It will expire on the weekend and will not be extended, France's U.N. Ambassador Gerard Araud said Thursday.

At least 238 new deaths were reported across Syria on Thursday, according to the opposition Local Coordination Committees of Syria. The deaths include 75 in Aleppo.

They also include 60 unidentified bodies found in Qatana, a Damascas suburb, the LCC said. The bodies, found in a landfill, "seem to have been executed in a massacre by the regime's army," the group said.

At least eight people were killed and more than 50 wounded when shells struck near an Aleppo bakery where people had lined up to buy bread, said Ahmad al-Zaeem, a commander in the rebel Free Syrian Army. At least 150 people have been wounded in the latest violence in Aleppo, he said.

A day earlier, Sayrian fighter jets launched rockets that hit a hospital in an opposition-controlled part of the metropolis. CNN witnessed the attack.

CNN's Ben Wedeman, reporting from western Syria, said Aleppo residents are left with no good options. If they stay in their homes, "there's a very good chance that they could be killed in an air raid, in this random shelling that goes on around the clock." If they leave, they're destitute and dependent on refugee agencies and relief groups. "So it's really a horrific situation, regardless of where you go."

The Syrian government, on state-run media, said Thursday that its forces had killed "terrorists" in Aleppo.

Syria also said its forces "dismantled an explosive device planted by an armed group near a mosque at the Meridian area in Aleppo."

Human Rights Watch condemned the regime Thursday after a fighter jet bombed a residential neighborhood in Azaz, in northern Aleppo province.

The New York-based rights group said an investigation showed that at least two bombs destroyed an entire block of houses in the city near the Turkish border.

Meanwhile, Syrian President Bashar al-Assad appointed a new governor of Aleppo province, Mohammed Wahid Aqaad, on Thursday, State TV said.

He also appointed Adnan Abdo al-Sukhni as minister of industry; Nijim hamad Al-Ahmad as minister of justice; and Saa'd al-Salam al Nayef as minister of health, state-run news agency SANA reported.

U.N. Secretary-General Ban Ki-moon estimated that more than 150,000 people have fled the nearly 18 months of fighting in Syria that has left 18,000 dead. Opposition groups report a death toll as high as 22,000.

CNN cannot independently confirm reports of casualties and violence by rebel and government forces. The Syrian government has severely restricted the access of international journalists.

"The Syrian people have suffered too much, too long. We cannot go on this way," Ban said Wednesday.

"The international community must feel the sense of collective responsibility on this situation. How long do we have to endure this kind of a tragedy? This is not justice and this is not acceptable."

Ban is searching for a successor to replace Kofi Annan, who resigned this month as the U.N. and Arab League joint special envoy for Syria amid what he called a lack of unity among members of the U.N. Security Council.

Russia and China, trade partners with Syria, have vetoed three Western-backed Security Council resolutions that called for al-Assad to end the violence and step down.

Even without a resolution, al-Assad's government has been under enormous international pressure following a brutal crackdown on a popular uprising that devolved into an armed conflict. The United States, the European Union and a number of Arab nations have slapped sanctions on its top officials, its Central Bank and oil companies.

The Organization of Islamic Cooperation, the group that attempts to offer a collective voice of the world's 1.5 billion Muslims, suspended Syria's membership Wednesday. Iran, with its strong ties to Damascus, and Algeria were the sole opponents in the 57-nation body, which has a permanent delegation to the United Nations.

The OIC's move sends a message to al-Assad that its members will not accept the regime killing its people, Ekemeleddin Ihsanoglu, the organization's secretary-general, told CNN.

Ihsanoglu called on the Security Council to approve tougher resolutions against the Syrian regime.

The regime said Thursday its forces freed three journalists -- Yara Salah, Abdallah Tabra and Houssam Imad -- being held in El Tal, north of Damascus, according to Syrian State TV. The three, who work for the pro-regime station Al Ikhbariya, were taken by rebels while covering the fighting in a suburb north of Damascus, State TV said.