New Delhi  - Police in India's southern city of Bangalore Saturday said the eight bombs that hit the city a day earlier were "professionally assembled" and claimed they had a suspect behind the blasts, media reports said.

According to the Indian Home Ministry, two people were killed and six injured in the low-intensity blasts triggered by timer devices near bus stations and crowded places in Bangalore.

The city, capital of the southern Karnataka state is considered India's information technology capital as many foreign and domestic IT and software firms are based there.

Karnataka police chief R Sri Kumar said investigations so far had revealed that the bombs were professionally assembled by "highly trained hands", the NDTV network reported.

Low-grade ammonium nitrate was used to make the bombs and timer circuits were planted inside the explosives to trigger the blasts.

While no terrorist group claimed responsibility, Home Ministry officials believe Pakistan-based militant group Lashkar-e-Toiba (LeT) carried out the attacks along with local support from the banned Students' Islamic Movement of India.

The Karnataka police however suspects the blasts to be the handiwork of Harkat-ul-Jehadi Islami (HuJI) another Muslim militant group which is based in Bangladesh and has been blamed for recent terrorist attacks in India, the news channel reported.

Meanwhile, the Bangalore police defused another bomb on Saturday morning near Madiwala, the scene of two explosions on Friday.

Bangalore Police Commissioner Shankar Bidri said a man in his early 20s was seen placing a bucket-shaped object with the bomb in the area.

"It was a live bomb and has been defused," Bidri said adding the explosive contained a micro-chip, a detonator and explosive material, mixed with oil.

The police said it was preparing a sketch of the suspect based on the descriptions given by witnesses which could lead to clues in the bombings.

Bangalore remained on high alert as security at all key IT and biotech companies was tightened in the city. All major entry and exit points in Bangalore were under tight police scrutiny.

Additional police teams were also deployed at various crowded areas of the city, some of which were targets of Friday's terrorist strikes.

New Delhi and its surrounding areas were also placed on high alert as police kept an intensive vigil at bus stops and railway stations in the city. (dpa)