French Foreign Minister Laurent Fabius said that France and its allies are preparing an "indispensable" response and that it should be "thought-out, proportionate and firm."
Hollande on Thursday stressed the importance of a political solution and making the Syrian opposition a stronger alternative, notably with increased firepower.
"We will only achieve this if the international community is capable of bringing a stop to this escalation of violence, of which the chemical massacre is just one illustration," Hollande said after meeting Syrian opposition leader Ahmad al-Jarba.
France has a dozen cruise missile-capable fighter aircraft at military bases in the United Arab Emirates and the Horn of Africa nation of Djibouti. France's military was at the forefront of the NATO-led attacks on Libyan dictator Moammar Gadhafi in 2011, and led an intervention against extremists in Mali earlier this year.
French military officials confirmed that the frigate Chevalier Paul, which specializes in anti-missile and air-air capabilities, as well as the hulking transport ship Dixmude, had set off Thursday from the Mediterranean port of Toulon as part of normal training and operational preparations but denied reports that the move was linked to a Syrian intervention.
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Elaine Ganley in Paris contributed to this report.