SAN SALVADOR, El Salvador—El Salvador’s congress granted President Nayib Bukele’s request to declare a state of emergency early Sunday amid a wave of gang-related killings over the weekend. Fourteen people were killed Friday and 62 people died Saturday, a scale of violence that has not been seen for years. By comparison, there were 79 homicides in the entire month of February. Bukele announced the request Saturday in his social media accounts, and congress approved it early Sunday. The decree would suspend constitutional guarantees of freedom of assembly and loosen arrest rules for as much as thirty days, but could be extended. The homicides appeared linked to the country’s notorious street gangs, who effectively control many neighborhoods in the capital. The National Police reported they have captured five leaders of the Mara Salvatrucha or MS-13, who they claimed ordered the weekend killings. Bukele wrote in his social media accounts that he …