Which of the following are common signs of an improvised explosive device (IED)?

The identification of common signs of an improvised explosive device (IED) is crucial for ensuring safety and effective response. Unusual containers, wires, and suspicious behavior are all strong indicators of potential IED activity.

Unusual containers can include anything from everyday objects that are out of place to more explicitly suspicious items that may be rigged to create an explosive effect. Wires are often deliberately used to connect various components of an IED, such as triggering mechanisms or power sources. Additionally, suspicious behavior can indicate an individual attempting to hide or monitor the device, making it essential to be aware of context and human activity in relation to these indicators.

The other options highlight characteristics that are less relevant to identifying IEDs. Bright colors and flashing lights may not specifically signal an IED, as these features are more commonly present in signaling devices or attention-attracting objects rather than in concealed explosive threats. Heavy machinery and construction materials might suggest legitimate work sites, not necessarily an improvised explosive threat unless used in a way that aligns with IED characteristics. Lastly, animals acting aggressively can indicate various disturbances, but it is not a reliable sign of an IED, as they may react to numerous other environmental factors. Hence, the most relevant and telling signs related