Three construction workers were wounded on Thursday after a small bomb exploded on Indonesia's Java island, police said.
A garbage collector found the homemade bomb, made up of a plastic pipe filled with cable wires and explosive materials, in a drain in a residential complex in Semarang city in Central Java province around midday.
Indonesian policemen examine the site where a blast occured in Semarang. Three construction workers were wounded on Thursday after a small bomb exploded on Indonesia's Java island, police said.
"He then gave the bomb to the three men but it exploded as they were examining it. It was a low-explosive bomb," local police chief Elan Subilan told AFP.One man had a finger blown off in the explosion and two others sustained light injuries, Subilan said, without confirming if a terror group was behind the incident.
"We are investigating who were behind the explosion and their motive. In the meantime, we have increased security in the city," he said.Indonesia has arrested and jailed dozens of members of a new militant cell behind a series of attacks, including parcel bombs sent to liberal Muslim leaders and a counter-terrorism official.
Nobody was killed in those incidents.
The cell was believed to be responsible for suicide bomb attacks at a police mosque last April in West Java and in a church five months later in Central Java.Most of Indonesia's 240 million Muslims are moderates, but the country has struggled to deal with a radical fringe of extremists who have carried out numerous attacks including the 2002 Bali bombings that killed 202 people.