WEB: 1. Death map updated; new format in the worksclick: http://media.voanews.com/images/syriadeath300-may12.png

Pangea: http://gdb.voanews.eu/E2D28F51-10F1-49B4-A322-B09A96567CF7.png

2. Annan Plan Factbox #2238304

3. Timeline #2346878

4. Factbox of largest recent attacks #2467470

5. LCC statement: https://www.facebook.com/note.php?note_id=460111127349362

TYPE: OCN ))

At least seven people are dead after a car bomb ripped through Syria's eastern city of Deir el-Zour, on Saturday, an attack that could further strain a fragile cease-fire between the government and opposition.

A foreign ministry spokesman also says 100 people were wounded in the explosion which he said was caused by a bomb weighing 500 kilograms.

State-run media reports describe the bombing as a “terrorist blast. ” The SANA news agency showed photos of a heavily damaged building behind a huge pile of rubble.

Activists say the explosion occurred near a security agency.

Last week, twin bombings in Damascus killed 55 people.

On Thursday, U.N. Secretary-General Ban Ki-moon said he believed al-Qaida was behind the Damascus bombings. But Friday he told a small group of reporters that the “scale and sophistication” of the attacks showed they were carried out by “by a certain group with organization and clear intent.” He said the U.N. was still looking into it.

Meanwhile, activists said Syrian forces used tear gas and live ammunition on protesters in Aleppo, on Friday, in what opposition groups called one of the biggest protests since the anti-government uprising began 15 months ago.

The demonstrations erupted after Syrian security forces disrupted a student demonstration in Aleppo, on Thursday. Video taken from a U.N. vehicle showed security forces beating student protesters.

Also Friday, activists said there was intense government shelling in the opposition stronghold of Raston and the nearby city of Homs.

Hopes for peace may get some boost from international envoy Kofi Annan. A spokesman says the former U.N. chief is planning to return to Damascus to again pursue a peaceful solution to the conflict. But the spokesman said there is not a timetable yet for what would be Annan's first visit since brokering a cease-fire agreement in March.

The United Nations says the death toll from violence related to the anti-government uprising that erupted more than a year ago may now reach 10,000.