[Marricio]

pawn Код:

if(strcmp(cmdtext, "/911 police 187", true) == 0)
{
    SendClientMessage(playerid, COLOR_WHITE, "Dispatcher: Ok, Please remain calm and stay at your location, assistance will be there shortly.");
    SendClientMessageToAll(playerid, COLOR_RED, "Police Dispatcher: All units, we have a 187 at %s location, Requesting EMS and Police units for assistnace.");
    return 1;
}

Just a grammar issue. SendClientMessageToAll is the right one.