Police found six unexploded bombs in a Mumbai suburb on Wednesday as thousands celebrated the return of India's cricket team after winning the Twenty20 world title.
"These were live, country-made bombs ... but not of high intensity," a crime branch official told AFP, asking not to be named.
"One person has been arrested in connection with this," he added.
Police did not directly link the bombs to the celebrations, but the city was on high alert.
Huge crowds turned out to welcome the team along a 30-kilometres (20-mile) route south from the airport to the Wankhede cricket stadium.
The crude bombs were found in the Andheri suburb well north of the airport and off the celebration route.
Serial bomb blasts shook India's financial and entertainment capital Mumbai in 1993 killing 257 people. The campaign was allegedly organised by Mumbai's Muslim-dominated underworld in revenge for deadly Hindu-Muslim riots.
In July, 2006, another string of bombings targeting commuters and blamed on Muslim extremists killed 186 people.