Summarize this content to 2000 words in 6 paragraphs Police searched for two suspected gunmen, who they said had fled into the subway system of the Belgian capital of Brussels on Wednesday, prosecutors said.The police shut down several subway stations and had interrupted service on six line, according to a post on X by STIB, the Belgium public transportation service. The Belgian prosecutor’s office said no injuries had been reported during the incident at Clemenceau station in central Brussels, according to Reuters. Sources close to the investigation said the incident may have been drug-related.This is a developing story. Please check back for updates.