| Blockade of Nueva Concepción | 
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| A soldier stands guard in Nueva Concepción. | 
| Date | Began 17 May 2023 | 
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| Location |  | 
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| Resulted in | 50 arrests All 3 suspected killers capturedCapture of Fultón Locos Salvatruchos leaders
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5,000 soldiers500 police officers
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Unknown | 
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| Death(s) | 1 police officer killed prior to operation | 
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| Arrested | 50 alleged gang members, including the alleged original assassins and leaders of Fulton Locos Salvatruchos | 
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The blockade of Nueva Concepción (Spanish: Cerco de Nueva Concepción) was an operation by the military and police of El Salvador against Mara Salvatrucha members operating in the town of Nueva Concepción. It began on 17 May 2023, one day after a police officer was ambushed and murdered by alleged gang members; in response to the killing, the government deployed 5,500 soldiers and officers to the municipality and announced an operation to search for the perpetrators and other gang members. Despite initially meager results, police announced on 26 May that the operation had led to the capture of fifty gang members, including the supposed killers and various gang leaders.