Anti-terrorism and motorcycle units are on patrol next to the pastor's house, suspicious vehicles and passers-by are being checked, Hurriyet newspaper reported.
The relations between Washington and Ankara have grown tense recently over the pastor's detention. The United States has demanded his release. The US Treasury has introduced sanctions against two Turkish ministers over Brunson's arrest.
READ MORE: US to Slap New Sanctions on Turkey if It Refuses to Release US Pastor- Treasury
Following the Treasury sanctions, US President Donald Trump said in early August that he had authorized increased tariffs on steel and aluminium imports from Turkey. The announcement led to a sharp drop of the Turkish lira. In response, Ankara raised levies on 22 types of US goods.