German police have discovered another firebomb beside train tracks near Berlin.
It is the 16th firebomb found in four days.
Investigators found the bomb hidden in grass. It was made of two bottles with liquids and two bags filled with powder.
Experts were on hand to defuse the device, federal police spokesman Meik Gauer said.
Sixteen firebombs have been found in nine locations around the capital since Monday, forcing hundreds of trains to be delayed and frustrating thousands of passengers through partial shutdowns.
One went off, damaging a track west of the city, and another ignited but did not explode. Nobody has been injured.
It was not clear when the most recent bomb was placed. Authorities said that all of the devices could have been planted at the same time over the weekend.
A previously unknown leftist group has claimed responsibility for one of the firebombs.