Tajik journalist Temur Varki received a disquieting call from Paris police in late March, days after Islamic State group militants from his homeland allegedly carried out a massacre in Moscow.

The two officers questioned him about France¡¯s tiny community of immigrants from Tajikistan, an impoverished former Soviet republic in Central Asia.

¡°Who do you know? How many? Where?¡± Varki recalled the officers asking, with one of them speaking Russian, a commonly used language across Central Asia. Varki, a political refugee in France who has worked for outlets including the BBC, told the police callers he knew a handful of Tajiks in the country, mainly fellow emigres and dissidents.