Short answer. Yes, if it was truly a pure accident. Article 1221 says that if the thing has been lost or the prestation has become impossible without the fault of the solidary debtors, the obligation shall be extinguished. So where nobody was at fault and no debtor was in delay, all of you are released.
What the law says
If the thing has been lost or if the prestation has become impossible without the fault of the solidary debtors, the obligation shall be extinguished.
Civil Code, Article 1221 — Loss of the Thing in Solidary Obligations. Read the full provision →
What the law says
If there was fault on the part of any one of them, all shall be responsible to the creditor, for the price and the payment of damages and interest, without prejudice to their action against the guilty or negligent debtor.
Civil Code, Article 1221 — Loss of the Thing in Solidary Obligations. Read the full provision →
No fault, no delay - the obligation is extinguished
Article 1221 governs what happens to a solidary obligation to deliver a specific thing when that thing is lost. Its first rule fits your facts: If the thing has been lost or if the prestation has become impossible without the fault of the solidary debtors, the obligation shall be extinguished. A genuine accident that no debtor caused, and that struck before any debtor was in delay, ends the obligation for everyone. The creditor bears the loss of the thing, and none of the solidary debtors owes its price. The key words are without the fault — that is exactly the pure-accident situation you describe.
Fault of even one debtor keeps everyone liable
The relief disappears the moment fault enters. The article continues: If there was fault on the part of any one of them, all shall be responsible to the creditor, for the price and the payment of damages and interest, without prejudice to their action against the guilty or negligent debtor. So a single debtor's fault in the loss makes all the solidary debtors answerable to the creditor — not just for the value of the thing, but for damages and interest too. That is the price of solidarity. The blameless debtors can then turn on the guilty one to recover, but toward the creditor they remain bound.
Delay is treated like fault
There is a second trap. Even a true fortuitous event will not excuse the debtors if it strikes too late. The article provides that where the loss or impossibility occurs by fortuitous event after one of the solidary debtors has incurred in delay through the creditor's judicial or extrajudicial demand, the previous paragraph applies — meaning all are again liable for the price, damages and interest. So once a demand has put one of you in delay, the group can no longer hide behind an accident. Timing matters: the same accident excuses everyone before delay, but not after it.
What this means for your situation
On your facts — destruction by pure accident, nobody at fault — the first rule controls and the obligation is extinguished for all of you, provided no debtor had already been placed in delay by a demand. What the article does not do is excuse a loss that any debtor caused or contributed to, nor one that happened after delay had set in; in those cases every solidary debtor answers to the creditor for price, damages and interest. And 'without fault' means just that: if the accident was avoidable through some debtor's negligence, it is not the pure accident that releases the group.