Three Emiratis arrested in Tanzania after a deadly attack on a church there a week ago have been freed and are back home, the Al-Khaleej daily reported on Monday.

Tanzanian authorities had arrested them "because they happened, by chance, to be at the site of the attack," the paper said, citing tweets of the United Arab Emirates foreign ministry.

Tanzanian police have arrested two more people bringing to eight the number of suspects held following a deadly bombing at a church in which three people died, officials said Tuesday.

Four Tanzanians and four Saudis have been arrested in the wake of the bomb, one of the first such incidents in Tanzania, which President Jakaya Kikwete described as an "act of terrorism."

Two people were killed in Sunday's attack during a mass at a Tanzanian church, officials said Monday, as President Jakaya Kikwete called the explosion an "act of terrorism".

Six people have been arrested, including four from Saudi Arabia, officials said.

At least 30 people were injured including three seriously in an explosion Sunday at a church in the northern Tanzanian city of Arusha, police said.

"There have been 30 people wounded, three in a serious condition, and one person has been arrested," said regional police chief Liberatus Sabas.

At least 13 people were killed in the northern Tanzanian city of Arusha when the sides of a quarry caved in, a local official said Tuesday.

"There are 13 dead but rescuers managed to save two people," said Mulongo Magessa, governor of Arusha province, of the accident that took place on Monday, days after a building collapse killed 36 people in the east African nation's commercial capital.

President Joyce Banda on Monday said Malawi was giving up on mediation efforts and would take to the courts to settle a long dormant border dispute with Tanzania which has been re-activated by prospects of an oil find.

"Our view is that we should eventually go to court. We should not waste time on this (mediation)," Banda told reporters in Lilongwe on return from visits to the United States and Britain.

Rescuers have pulled more bodies from the rubble of a building that collapsed in Tanzania's economic capital Dar es Salaam, bringing the toll to 34 three days after the crash, a local government official said on Monday.

"Ten bodies were found between Sunday afternoon and dawn today. This brings the total number confirmed dead to 34," Dar es Salaam Regional Commissioner Saidi Mecky Sadicky told Agence France Presse.

More bodies, including those of two children, have been pulled out of the rubble of the building that collapsed in Dar es Salaam, bringing the toll to 17, a local government official said Saturday.

"So far the number of people who are dead is 17. This includes two children," regional commissioner Saidi Mecky Sadicky told Agence France Presse.

Dozens of people were feared trapped after a building under construction collapsed in Tanzania's economic capital of Dar es Salaam Friday, according to witnesses.

"I thought there was an earthquake and then I heard screaming. The whole building fell on itself," eyewitness Musa Mohamed told Agence France Presse.

Conflict in eastern Democratic Republic of Congo and the political crises in Madagascar and Zimbabwe will top the agenda of a summit of southern African countries in Tanzania on Thursday, officials said.

In addition to host Jakaya Kikwete of Tanzania, the Southern African Development Community (SADC) summit will be attended by South African President Jacob Zuma and his counterpart Hifikepunye Pohamba of Namibia, the other two nations in the SADC troika handling regional security issues.