Analysis Summary:

The article's accuracy is mixed. The claim that Syria previously served as a base of operations for Palestinian armed factions is supported by available sources. However, the specific details of the arrests and the reasons behind them are not verifiable with the provided sources, leading to a moderate bias due to potential selective reporting.

Detailed Analysis:

• Claim:** "Syria Makes Rare Arrests of Palestinian Militant Group Leaders" - This claim is not directly verifiable with the provided sources. The sources do not confirm or deny these specific arrests.
• Claim:** "Under the Assad regime, Syria served as a base of operations for several Palestinian armed factions." - This claim is supported by Verification Source #1, which states that the senior leadership of at least one group resides in Syria.
• Claim:** The arrests marked a pendulum swing for the government. - This is an interpretive claim that cannot be directly verified with the provided sources. It suggests a change in policy, but the sources do not provide enough context to confirm this.

Supporting Evidence/Contradictions:

• Verification Source #1:** Supports the claim that Syria served as a base of operations for Palestinian militant groups.
• Verification Source #3:** Mentions arrests of Palestinians in Syria in 2000, but does not confirm or deny the current arrests.
• Verification Source #2, #4, #5:** Do not directly address the claims made in the article.
• Lack of Coverage:** The provided sources do not confirm or deny the specific arrests mentioned in the article title and first sentence. This lack of coverage limits the ability to assess the factual accuracy of the core claim.